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Earnings per Share - Calculation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Calculation of basic earnings per share:    
Net income applicable to common stock $ 51.5 $ 90.5
Weighted-average common shares outstanding - basic (in shares) 168.2 155.7
Basic earnings per share (in dollars per share) $ 0.31 $ 0.58
Calculation of diluted earnings per share:    
Net income applicable to common stock $ 51.5 $ 90.5
Convertible Notes 1.8 4.3
Diluted income applicable to common stock $ 53.3 $ 94.8
Weighted average common shares outstanding - diluted (in shares) 184.2 172.8
Diluted earnings per share (in dollars per share) $ 0.29 $ 0.55
Effective tax rate 48.00% 18.50%
Convertible Notes    
Calculation of diluted earnings per share:    
Effective tax rate 20.00%  
Common Stock, Non-Exchangeable    
Calculation of basic earnings per share:    
Weighted-average common shares outstanding - basic (in shares) 167.5 155.7
Common Stock, Exchangeable    
Calculation of basic earnings per share:    
Weighted-average common shares outstanding - basic (in shares) 0.7 0.0