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Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of the quarterly results of operations |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 2,814.0 | $ 2,974.5 | $ 2,988.9 | $ 2,757.1 | $ 2,376.4 | $ 2,450.1 | $ 2,475.2 | $ 2,419.3 | $ 11,534.5 | $ 9,721.0 | $ 8,613.4
Cost of sales | 2,104.2 | 2,140.2 | 2,071.4 | 1,937.2 | 1,697.8 | 1,764.6 | 1,773.1 | 1,697.7 | 8,253.0 | 6,933.2 | 6,023.1
Gross profit | 709.8 | 834.3 | 917.5 | 819.9 | 678.6 | 685.5 | 702.1 | 721.6 |  |  |
Net income | 87.3 | 150.3 | 233.1 | 171.1 | 303.8 | 99.0 | 104.8 | 113.4 | 641.8 | 621.0 | 309.1
Net income attributable to Reliance | $ 85.6 | $ 148.3 | $ 230.8 | $ 169.0 | $ 301.4 | $ 97.3 | $ 103.0 | $ 111.7 | $ 633.7 | $ 613.4 | $ 304.3
Diluted earnings per common share (in dollars per share) | $ 1.22 | $ 2.03 | $ 3.16 | $ 2.30 | $ 4.09 | $ 1.32 | $ 1.40 | $ 1.52 | $ 8.75 | $ 8.34 | $ 4.16
Basic earnings per common share (in dollars per share) | $ 1.23 | $ 2.06 | $ 3.19 | $ 2.32 | $ 4.14 | $ 1.33 | $ 1.41 | $ 1.53 | $ 8.85 | $ 8.42 | $ 4.21

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