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Earnings per Share (EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Jan. 31, 2018
EPS numerator:        
Income from continuing operations, net of income taxes $ 133.3 $ 208.3    
Less: Series A Convertible Preferred Stock dividends 0.0 102.5    
Less: Net income (loss) attributable to noncontrolling interests 5.7 (2.1)    
Income from continuing operations attributable to common stockholders, before allocation of earnings to participating securities 127.6 107.9    
Less: Earnings allocated to participating securities 0.0 6.0    
Income from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (1) 127.6 101.9    
Loss from discontinued operations, net of income taxes (3.4) (1.3)    
Less: Loss from discontinued operations allocated to participating securities 0.0 (0.1)    
Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities (3.4) (1.2)    
Net income attributable to common stockholders, after allocation of earnings to participating securities (1) $ 124.2 $ 100.7    
EPS denominator:        
Weighted average shares outstanding — basic 108.5 120.9    
Impact of dilutive securities 2.0 2.3    
Weighted average shares outstanding — diluted 110.5 123.2    
Basic EPS attributable to common stockholders:        
Income from continuing operations, per basic share $ 1.18 $ 0.84    
Loss from discontinued operation, per basic share (0.04) (0.01)    
Basic income per share (in dollars per share) 1.14 0.83    
Diluted EPS attributable to common stockholders:        
Income from continuing operations, per diluted share 1.15 0.83    
Loss from discontinued operations, per diluted share (0.03) (0.01)    
Diluted income per share (in dollars per share) $ 1.12 $ 0.82    
Earnings Per Share Table Footnotes        
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted $ 0.1      
Weighted Average Number of Shares Outstanding, Diluted   8.4    
Earnings per share textuals        
Antidilutive shares excluded from EPS calculation 0.3 0.1    
Convertible Preferred Stock        
Earnings per share textuals        
Preferred stock, shares issued 0.0   0.0 30.0
Common Stock | Common Stock        
Earnings per share textuals        
Common stock, shares converted from convertible preferred stock       59.3