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Common Share-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
6 Months Ended
May 24, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common share-based compensation expense   $ 95.2 $ 109.4
Fair value of vested shares   $ 94.3 $ 133.3
Weighted average fair value of shares granted (usd per share)   $ 14.09 $ 19.77
Unrecognized compensation cost related to non-vested shares   $ 327.7  
Weighted average non-vested shares compensation cost expected to recognize   2 years 6 months 29 days  
Restricted stock awards | OppenheimerFunds      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock issued (shares) 6.2