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Earnings per Share (EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 31, 2018
EPS numerator:        
(Loss) income from continuing operations, net of income taxes $ (1,859.8) $ (188.3) $ 645.7  
Less: Series A Convertible Preferred Stock dividends 0.0 0.0 102.5  
Less: Net (loss) income attributable to noncontrolling interests (3.5) 26.2 16.9  
(Loss) income from continuing operations attributable to common stockholders, before allocation of earnings to participating securities (1,856.3) (214.5) 526.3  
Less: Earnings allocated to participating securities 0.0 0.0 7.9  
(Loss) income from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (1,856.3) (214.5) 518.4  
(Loss) income from discontinued operations, net of income taxes (14.0) 3.2 18.1  
Less: Income from discontinued operations allocated to participating securities 0.0 0.0 0.3  
(Loss) income from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities (14.0) 3.2 17.8  
Net (loss) income attributable to common stockholders, after allocation of earnings to participating securities $ (1,870.3) $ (211.3) $ 536.2  
EPS denominator:        
Weighted average shares outstanding — basic (in shares) 97.7 103.7 119.3  
Impact of dilutive securities (in shares) 0.0 0.0 1.7  
Weighted average shares outstanding — diluted (in shares) 97.7 103.7 121.0  
Basic EPS attributable to common stockholders:        
(Loss) income from continuing operations (in dollars per share) $ (18.99) $ (2.07) $ 4.35  
(Loss) income from discontinued operations (in dollars per share) (0.15) 0.03 0.15  
Basic (loss) income per share (in dollars per share) (19.14) (2.04) 4.50  
Diluted EPS attributable to common stockholders:        
(Loss) income from continuing operations (in dollars per share) (18.99) (2.07) 4.28  
(Loss) income from discontinued operations (in dollars per share) (0.15) 0.03 0.15  
Diluted (loss) income per share (in dollars per share) $ (19.14) $ (2.04) $ 4.43  
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted     $ 0.1  
Weighted average shares outstanding — diluted (in shares)     2.1  
Earnings per Share (EPS) (Textuals) [Abstract]        
Antidilutive shares excluded from EPS calculation 2.2 1.9 0.1  
Convertible Preferred Stock        
Earnings per Share (EPS) (Textuals) [Abstract]        
Preferred Stock, shares issued (in shares)       30.0
Common Stock        
Earnings per Share (EPS) (Textuals) [Abstract]        
Convertible preferred stock, shares issued upon conversion       59.3