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Basic and Diluted Income Per Common Share - Computation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Net income attributable to common stock and participating preferred stockholders $ 9.0 $ 54.7 $ 7.4 $ 19.0
Participating shares at end of period:        
Weighted-average Common stock outstanding (in shares) 45.6 44.2 45.2 44.1
Unvested restricted stock (in shares) 0.6 0.4 0.5 0.3
Preferred stock (as-converted basis) (in shares) 2.1 4.8 2.2 4.8
Total (in shares) 48.3 49.4 47.9 49.2
Percentage of loss allocated to:        
Common stock 94.50% 89.50% 94.40% 89.60%
Unvested restricted stock 1.20% 0.80% 1.00% 0.60%
Preferred stock 4.30% 9.70% 4.60% 9.80%
Net Income attributable to common stock, basic $ 8.5 $ 48.9 $ 7.0 $ 17.0
Distributed and Undistributed earnings to Common Shareholders:        
Effect of assumed shares under treasury stock method for stock options and restricted shares and if-converted method for convertible instruments (1.4) 0.1 (2.4) 0.0
Net Income attributable to common stock, diluted $ 7.1 $ 49.0 $ 4.6 $ 17.0
Denominator for basic and dilutive earnings per share        
Effect of assumed shares under treasury stock method for stock options and restricted shares (in shares) 12.5 1.3 14.7 1.2
Weighted average common shares outstanding - diluted (in shares) 58.1 45.5 59.9 45.3
Net income (loss) attributable to participating security holders - Basic (in dollars per share) $ 0.19 $ 1.11 $ 0.15 $ 0.39
Net income (loss) attributable to participating security holders - Diluted (in dollars per share) $ 0.12 $ 1.08 $ 0.08 $ 0.38