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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Net sales $ 430.4 $ 369.8
Cost of sales 255.6 263.8
Gross margin 174.8 106.0
Selling, general and administrative expense 58.4 45.3
Other operating income (expense):    
Currency transaction losses, net (5.0) (0.2)
Other operating expense, net (3.9) (4.1)
Income from operations 107.5 56.4
Other income (expense):    
Interest and dividend income 1.0 0.2
Securities transactions, net (0.2)  
Other components of net periodic pension and OPEB cost (3.8) (4.1)
Interest expense (4.8) (4.7)
Income before income taxes 99.7 47.8
Income tax expense 29.0 11.0
Net income $ 70.7 $ 36.8
Net income per basic and diluted share $ 0.61 $ 0.32
Cash dividends per share $ 0.17 $ 0.15
Weighted average shares used in the calculation of net income per share 115.9 115.9