Anthony Staffieri
Analyst · Vince Valentini with TD Securities
Thank you, Joe, and good afternoon, everyone. We're truly pleased with our performance this quarter. Our financial results reflect the continued momentum we exhibited throughout 2017 while also delivering solid key operational metrics.
For this first quarter ended, you'll see the implementation of a few changes to our accounting policies and disclosures, all that we had previously communicated to you. Firstly, we commenced reporting our financials with the adoption of the IFRS 15 accounting standard and have provided comparative growth rates for the relevant figures by restating the 2017 figures on a like-for-like basis. And to use the transition to this new accounting standard, we've also disclosed our figures under the previous accounting standards, again, with consistent year-on-year comparisons. The new IFRS 15 accounting standard only impacts our Wireless and consolidated results. And as previously communicated, we now report adjusted EBITDA, which now includes stock-based compensation expense instead of adjusted operating profit, and you will recall our guidance for 2018 was based on adjusted EBITDA. Finally, our Cable segment is now inclusive of Rogers Business Solutions and our Smart Home Monitoring business, and prior period comparisons were adjusted accordingly.
Turning now to our consolidated results. We posted overall service revenue growth of 6% and adjusted EBITDA growth of 11% using our previous accounting standard. Under IFRS 15 accounting, this translated to service revenue growth of 5% and adjusted EBITDA growth of 14%. These differences in growth rates relate to our Wireless business, which I'll explain more fully in a moment.
Our consolidated adjusted EBITDA growth rates reflect continued meaningful margin expansion as well: 170 basis points of expansion when measured under the previous accounting standard despite increased investments in key areas, such as customer handsets. Our cost initiatives delivered meaningful offsetting cost reductions. Under IFRS 15 accounting, our margin expansion is 200 basis points in the first quarter.
A year ago, we said we would deliver cumulative margin expansion of 100 to 200 basis points in 2018 over 2016 in both Wireless and Cable. We made great progress on this front in 2017, and we will continue to do so this year. You may see some lumpiness during the 2018 quarters, but we remain committed to our targets for the full year.
Turning now to our Wireless business. Utilizing our prior accounting standards, we reported service revenue growth of 7% and adjusted EBITDA growth of 9%. Here, our revenue increase reflected solid growth in our subscriber base, but importantly, continued strong growth in blended ARPU, which was 5% this quarter. Our adjusted EBITDA growth in Wireless reflected margin expansion of 80 basis points under the previous accounting standards. Despite increasing spending on handset subsidies by $85 million year-over-year, other operating costs were reduced by 5% to deliver a healthy flow-through rate of 57%.
In applying IFRS 15 to our Wireless business, service revenue grew 5% in the quarter. This compares to the 7% I just mentioned using the previous accounting standard, slightly lowered growth rate as the recovery of the handset subsidy piece of our monthly bill is, in essence, removed from our service revenue. As a result of this change to the service revenue, ARPU is otherwise less than what it would have been under the previous standard and not reflective of the amount to be paid by the customer each month. To assist in understanding the underlying economics, we are now disclosing average billings per user, or ABPU, which approximates ARPU under the previous accounting standard and reflects the same growth rate year-on-year.
On adjusted EBITDA using IFRS 15, our Wireless business grew 13%, higher than the 9% under the previous accounting rules as now embedded equipment revenue for the full contract term is approved upfront on signing of the contract, thereby increasing total revenues and adjusted EBITDA. Operating expenses under IFRS 15 are higher than under the prior accounting basis as we recognized more bad debt expense upfront associated with a higher upfront revenue. Slightly offsetting this, though, commission expenses are now deferred and amortized over the contract term rather than expenses incurred under the prior accounting basis.
Finally, in addition to these strong revenues and profitability metrics under both accounting standards, we delivered 95,000 postpaid net subscriber additions in the quarter, reflecting both the highest level of first quarter postpaid gross additions and the lowest postpaid churn rates in 15 years.
Turning to Cable. We grew Cable revenue by 1% and adjusted EBITDA by 4%. Driving these results is Internet revenue growth of 7%, reflecting the expanding size of the Internet market but also continued demand for increased speed, and as a result, increased data usage by our customers. The percentage of our residential Internet based on speeds of at least 100 megabits per second has reached 56% compared with 48% last year. The corresponding ARPU growth we see with this demand has been supported by our ability to offer Ignite Gigabit Internet to our entire footprint, supporting real-time healthy economics for our continued network investments.
Despite a heightened level of competition this quarter, we attracted 26,000 Internet net additions. We're focused on the long-term economics of our business and look to balance subscriber growth while remaining profitable. And in Cable, I'm pleased to report that the numbers are the same under both old accounting and IFRS 15. In Media, we delivered excellent results across both revenue and adjusted EBITDA. Revenue grew across our entire portfolio with the exception of publishing, and sports continues to lead this growth. Our revenue included another distribution from Major League Baseball in respect of the sale of certain digital assets. Even without this distribution, though, our Media division delivered healthy revenue and adjusted EBITDA growth of 4% and 47%, respectively. And here, too, I'm pleased to tell you the Media results are the same under IFRS 15 and the previous accounting policy.
I'll now go through some additional details on our financial results. Free cash flow grew 18% this quarter despite the impact of increased CapEx. We previously communicated that we would increase the investments in our Wireless and Cable networks, and this was reflected in our capital spending this quarter. We continue to prepare for 5G in Wireless and further increase speed and capacity of our fiber-coax network in Cable. All of the milestones we've set for ourselves in 2018 on the network investment front will be accomplished within the CapEx guidance we previously provided for the year.
With respect to our financial flexibility, strong adjusted EBITDA helped generate operating cash flow of $885 million in the quarter, which supported dividend payments of $247 million this quarter. Significantly, we ended the quarter with a debt leverage ratio of 2.7 compared to 3.0 a year ago, which was driven by higher adjusted EBITDA and lower net debt.
As well, you may have noticed that we announced today that the Toronto Stock Exchange has accepted our Notice of Intention to commence a normal course issuer bid. To be clear, we remain focused on investing in the fundamentals of our business to continue to drive long-term sustainable growth. However, we've initiated this normal course issuer bid application to provide us the capability to be opportunistic if broad equity market conditions and/or share price volatility warrants.
Finally, thank you for your patience as I crawl through the impact of IFRS 15 on our Wireless and consolidated figures, but we thought it important that you fully understand the changes and its implications. Further, our guidance ranges, as we previously communicated, remain the same for both IFRS 15 and the previous accounting standard. It's worth highlighting that IFRS 15 hasn't changed the underlying economics of our business. You'll note that free cash flow doesn't change, and the fundamental drivers of customer lifetime values don't change and neither will our focus. This quarter was an excellent start to the year and set the right tone for us to meet our strong growth targets. We're focused on sustainable growth, the right mix of customers in our business and continually refining our cost structure while improving the customer experience.
With that, I'll ask the operator to open the lines for questions.