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Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net income (loss) $ 4.2 $ (1.9)
Denominator:    
Weighted average shares outstanding, basic (in shares) 44.7 44.5
Dilutive effect of stock-based awards (in shares) 0.5 0.0
Weighted average shares outstanding, diluted (in shares) 45.2 44.5
Basic earnings (loss) per share (in dollars per share) $ 0.09 $ (0.04)
Diluted earnings (loss) per share (in dollars per share) $ 0.09 $ (0.04)
Equity-Based Awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (in shares) 2.3 3.4
Convertible Debt    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (in shares) 6.9 6.9