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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
CONSOLIDATED STATEMENTS OF INCOME |  |
Net sales | $ 2,572.9 | $ 2,956.6
Costs and expenses: |  |
Cost of sales (exclusive of depreciation and amortization shown below) | 1,792.2 | 2,089.7
Warehouse, delivery, selling, general and administrative | 522.7 | 532.1
Depreciation and amortization | 57.0 | 54.0
Impairment of long-lived assets | 97.7 |
Total costs and expenses | 2,469.6 | 2,675.8
Operating income | 103.3 | 280.8
Other expense: |  |
Interest expense | 16.9 | 24.2
Other expense, net | 3.3 | 1.1
Income before income taxes | 83.1 | 255.5
Income tax provision | 20.2 | 63.9
Net income | 62.9 | 191.6
Less: Net income attributable to noncontrolling interests | 1.2 | 1.5
Net income attributable to Reliance | $ 61.7 | $ 190.1
Earnings per share attributable to Reliance stockholders: |  |
Diluted (in dollars per share) | $ 0.92 | $ 2.80
Basic (in dollars per share) | $ 0.93 | $ 2.83
Shares used in computing earnings per share: |  |
Diluted (in shares) | 67,248 | 67,926
Basic (in shares) | 66,337 | 67,127
Cash dividends per share (in dollars per share) | $ 0.625 | $ 0.55

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- References No definition available. + Details
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