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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net sales $ 610.9 $ 504.6
Operating costs and expenses:    
Cost of sales 455.0 415.5
Depreciation and amortization 30.6 27.9
Selling and administrative 48.6 42.3
Loss on sale or impairment of long-lived assets, net 0.6 0.0
Other operating credits and charges, net 3.4 0.0
Total operating costs and expenses 538.2 485.7
Income from operations 72.7 18.9
Non-operating income (expense):    
Interest expense, net of capitalized interest (5.0) (8.0)
Investment income 2.0 1.8
Other non-operating items (0.3) 0.5
Total non-operating income (expense) (3.3) (5.7)
Income before taxes and equity in income of unconsolidated affiliates 69.4 13.2
Provision for income taxes 15.5 4.4
Equity in income of unconsolidated affiliates (1.1) (1.5)
Net income $ 55.0 $ 10.3
Net income per share of common stock:    
Net income per share - basic $ 0.38 $ 0.07
Net income per share - diluted $ 0.38 $ 0.07
Weighted average shares of stock outstanding - basic 144.2 142.9
Weighted average shares of stock outstanding - diluted 145.9 145.2