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Summary of Significant Accounting Policies - Earnings Per Common Share (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2016
Jun. 21, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Anti-dilutive securities excluded from computation of earnings per common share (in shares) 8,273,612 1,474,558 1,795,632    
Average share price (in dollars per share) $ 103.62        
Exchangeable senior notes $ 0 $ 569,513,000      
Series A Units          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Anti-dilutive securities excluded from computation of earnings per common share (in shares) 875,480 0 0    
Instruments to be settled in cash (at least) $ 101,700,000        
Options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Anti-dilutive securities excluded from computation of earnings per common share (in shares) 0 0 36,075    
2015 Notes          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Exchangeable senior notes $ 575,000,000        
Fixed interest rate 3.125%     3.125%  
Shares related to the Notes included in the computation for diluted earnings per share (in shares)   993,114 993,114    
2013 Notes          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Fixed interest rate         2.375%
Shares related to the Notes included in the computation for diluted earnings per share (in shares) 0 0