Anthony Staffieri
Analyst · TD Securities
Thank you, Joe, and good morning, everyone. We had another quarter of strong execution, and we're extremely proud of our results. We continue to build on the fundamentals of our business, and this is reflected in both our financial and operational performance this quarter. Our top line growth is still coming along nicely and, combined with our cost playbooks, is translating into meaningful improvement on both adjusted EBITDA and our margins.
As a reminder, we implemented accounting standard IFRS 15 last quarter, and all the financial figures I'll be discussing are under this new standard. To help with the transition, we've provided the financial results for this quarter under the previous accounting standard with year-over-year comparisons in the supplemental information posted on our website.
On our consolidated results, we posted total revenue growth of 4% and adjusted EBITDA growth of 8%. As we drive cost efficiency deeper and deeper into our culture, we see margins improve and progress towards our full year goal of 100 to 200 basis point improvement in 2018 compared to 2016. Adjusted EBITDA margin grew 160 basis points this quarter, and at the same time, we delivered strong subscriber numbers in both Wireless and Cable.
Turning now to our Wireless business, we reported service revenue growth of 5% driven by excellent subscriber performance and the strength of our ARPU growth. Consumer demand for data is still the largest contributor to the health of our ARPU. We continue to see network usage grow year-on-year, and the 3% and 4% growth we saw in blended ARPU and blended average billing per user, or ABPU, respectively, in the quarter remains consistent with our goal of delivering 2% to 4% full year growth on blended ARPU and 3% to 5% on blended ABPU.
Not only do we see impressive growth in ARPU and ABPU, we also reported 122,000 postpaid net subscriber additions and postpaid churn of 1.01% in the quarter, reflecting both the highest level of second quarter postpaid gross additions and the lowest postpaid churn rates in nearly a decade.
On adjusted EBITDA for Wireless, we reported growth of 12%. We again saw Wireless margin expansion this quarter with margins expanding 240 basis points, as we steadily improve our cost structure. We're taking our fair share of subscribers in a growing market on the back of long-term sustainable economics.
Turning to Cable, we grew revenue by 2%. Internet remains the growth engine here with revenue growth of 10%. This reflects our ability to monetize consumer demand for data while continuing to attract and retain customers. The percentage of our residential Internet based on speeds of at least 100 megabits per second has reached 58% compared with 51% at this time last year. With our ability to offer Ignite Gigabit Internet to our entire footprint, Internet is the anchor product for us. In this quarter, we had 23,000 net additions, which is the best Q2 result we've had since 2005.
The strength of our Internet offering is translating not just in the stronger attach rates with our TV and phone products but is also driving continued positive net household additions.
Our Cable business also delivered growth in adjusted EBITDA of 2%. We kept our margin levels at similar levels to the prior year despite improved subscriber loading and significant planned investments in our frontline employees. From a year-to-date perspective, margins here have improved 70 basis points, and we remain on track for our planned full year margin expansion of 80 to 100 basis points over 2017.
In Media, revenue declined year-on-year largely due to the Blue Jays. The cost efficiency initiatives across our other Media assets delivered Media-adjusted EBITDA growth of 2% in the quarter.
Turning now back to our consolidated figures, capital spending increased 46% this quarter year-over-year, which drove a decline of 7% in free cash flow. I should highlight, however, that last year in the second quarter, we had real estate sale proceeds, which decreased our reported net capital spend. Normalizing for this disposition, our free cash flow in the current quarter would have increased 5%.
On the capital front, we're progressing as anticipated on the investments on our networks. In Wireless, we're investing in 4.5G and paving the way for 5G. In Cable, our hybrid fibre-coax network continues to provide us network capabilities that surpass consumer demand. And we continue to pull forward spend on node segmentation to recognize better economies of scale. The timing of our CapEx spend will be uneven quarter-to-quarter, but we will be within the CapEx guidance range we provided earlier this year.
With respect to our financial flexibility, strong adjusted EBITDA helped generate operating cash flow of $1.05 billion, which supported dividend payments of $247 million this quarter.
We ended the quarter with a debt leverage ratio of 2.6 compared to 3.0 a year ago, which was driven by higher adjusted EBITDA and lower net debt. We have made steady improvement on this front and moved closer to our optimal ratio range of 2 to 2.5x. Our balance sheet remains healthy with liquidity of $2.05 billion at the end of the quarter with solid investment-grade ratings and stable outlooks.
While we're pleased with our progress here, we're focused on the value drivers of the business, and we'll revisit long-term sustainable dividend growth at the right time.
To sum it up, we've executed on the key areas we laid out. With our focus on the fundamentals of the business, this quarter reflects another step in delivering on the strong guidance we announced earlier this year.
With that, I'll ask the operator to open the lines for questions.