Net operating cash improved $230.2 million to $1.66 billion in the nine months. This strong cash generation allowed us to return cash of approximately $892.6 million to our shareholders in the form of dividends and share repurchases. The Company purchased 1,325,000 shares of its common stock in the first nine months, and at September 30, 2019, the Company had remaining authorization to purchase 8.80 million shares of its common stock through open market purchases.
Commenting on the third quarter, John G. Morikis, Chairman and Chief Executive Officer, said, “Sherwin-Williams delivered strong results in the quarter as adjusted earnings per share increased 17.1% year-over-year to $6.65. Our performance in the quarter was driven by continued strength in North American architectural paint markets, which offset choppiness in some industrial end markets. U.S. and Canada same store sales growth was 8.1% as our pro painting customers continued to report strong demand. As a result of this strong volume and operating efficiencies, consolidated gross margin expanded over 300 basis points to 45.7%. Adjusted EBITDA margin in the quarter improved 150 basis points to 18.9% compared to the prior year.
“For the second consecutive quarter, all three operating segments increased segment profit and margin compared to the same period last year. In The Americas Group, our North American paint stores generated strong growth in all regions and all customer end markets, led by double digit growth in residential repaint. With the strong volume, the team delivered incremental operating margin of approximately 37%, and we have opened 31 net new stores year to date. In the Consumer Brands Group, sales decreased more than expected due primarily to softness in some international markets. In North America, we continued to strengthen our relationships with our largest retail partners. The team has done a nice job of controlling selling expenses, while continuing to realize synergies and improving year over year supply chain costs. The Performance Coatings Group was impacted by slowing industrial demand in some end markets, leading to slightly lower sales in the quarter. Despite the softer than expected top line, the team remained focused on controlling selling expenses, and with moderating raw material costs, adjusted segment profit and margin increased year over year.
“For the fourth quarter, we anticipate our consolidated net sales will increase by a low single digit percentage compared to last year’s fourth quarter. For the full year 2019, we expect our consolidated net sales will increase by a low single digit percentage compared to the full year 2018. We are updating our full year 2019 diluted net income per share guidance to be in the range of $17.07 to $17.47 per share. Diluted net income per share in 2018 was $11.67 per share, including a charge of $4.15 per share for acquisition-related costs and a charge of $2.71 per share fornon-operating expenses. We are increasing our full year 2019 adjusted diluted net income per share guidance to be in the range of $20.90 to $21.30 per share, excluding charges for acquisition-related costs andnon-operating expenses, compared to $18.53 per share for the full year 2018 on a comparable basis.”
The Company will conduct a conference call to discuss its financial results for the third quarter, and its outlook for the fourth quarter and full year 2019, at 11:00 a.m. EDT on Tuesday, October 22, 2019. The conference call will be webcast simultaneously in the listen only mode by Issuer Direct. To listen to the webcast on the Sherwin-Williams website,www.sherwin.com, click on About Us, choose Investor Relations, then select Press Releases and click on the webcast icon following the reference to the October 22nd release. The webcast will also be available at Issuer Direct’s Investor Calendar website,www.investorcalendar.com. An archived replay of the live webcast will be available atwww.sherwin.com beginning approximately two hours after the call ends and will be available until November 8, 2019 at 5:00 p.m. EST.
Founded in 1866, The Sherwin-Williams Company is a global leader in the manufacture, development, distribution, and sale of paints, coatings and related products to professional, industrial, commercial, and retail customers. Sherwin-Williams manufactures products under well-known brands such as Sherwin-Williams®, Valspar®, HGTV HOME® by Sherwin-Williams,Dutch Boy®, Krylon®, Minwax®, Thompson’s® Water Seal®, Cabot® and many more. With global headquarters in Cleveland, Ohio, Sherwin-Williams® branded products are sold exclusively through a chain of more than 4,900 company-operated stores and facilities, while the company’s other brands are sold through leading mass merchandisers, home centers,