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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Allowance for trade receivable $ 22.4 $ 38.6
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.1 $ 0.10
Common stock, shares authorized (in shares) 260,000,000 260,000,000
Common stock, shares issued (in shares) 185,983,792 185,983,792
Treasury stock, shares (in shares) 53,702,178 51,653,236