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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance $ 4.6 $ 1.9
Preferred stock, shares authorized 2,500,000.0 2,500,000.0
Preferred stock, par value (usd per share) $ 0.001 $ 0.001
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, shares authorized 300,000,000.0 300,000,000.0
Common stock, par value (usd per share) $ 0.001 $ 0.001
Common stock, shares issued 112,300,000 116,400,000
Common stock, shares outstanding 112,300,000 116,400,000