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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Statement Of Financial Position [Abstract]    
Trade receivables, net of allowance for doubtful accounts $ 24.6 $ 24.9
Inventory reserves $ 25.6 $ 21.9
Preferred stock, par value per share $ 0.10 $ 0.10
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares issued 0 0
Common stock, par value per share $ 0.10 $ 0.10
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 227,151,277 225,625,636
Common stock, shares outstanding 197,157,078 196,013,299
Common stock in treasury, shares 29,994,199 29,612,337