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Equity - Share Repurchase Plan, Preferred Stock (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
item
$ / shares
shares
Dec. 31, 2020
USD ($)
item
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Jul. 20, 2021
USD ($)
Share Repurchase Plan        
Value of shares authorized by the Board of Directors to be repurchased under share repurchase plan | $       $ 1,000.0
Remaining value of shares authorized by the Board of Directors to be repurchased under share repurchase plan | $ $ 712.6      
Repurchase of common shares (in shares) 2,100,000 3,700,000 600,000  
Average costs per share | $ / shares $ 153.55 $ 91.80 $ 84.33  
Value of shares repurchased | $ $ 323.5 $ 337.3 $ 50.0  
Preferred Stock        
Preferred stock, authorized shares 5,000,000 5,000,000    
Preferred stock, par value (in dollars per share) | $ / shares $ 0.001 $ 0.001    
Preferred stock, issued shares 0 0    
Preferred stock, outstanding shares 0 0    
Minimum number of series in which preferred shares may be issued | item 1 1