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Common Share-Based Compensation (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
May 24, 2019
shares
Dec. 31, 2020
USD ($)
award
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
May 31, 2016
shares
May 31, 2010
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common share-based compensation expense   $ 188.5 $ 207.5 $ 172.4    
Income tax benefit from share-based compensation agreements   $ 27.8 38.1 40.8    
Number of award categories | award   2        
Fair value of vested shares   $ 124.6 $ 177.1 $ 160.8    
Weighted average fair value of shares granted (in USD per share) | $ / shares   $ 14.09 $ 19.66 $ 31.78    
Unrecognized compensation cost related to non-vested shares   $ 221.8        
Weighted average non-vested shares compensation cost expected to recognize   2 years 3 months        
2016 Global Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized under share awards plan (shares) | shares         31.4  
2010 Global Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized under share awards plan (shares) | shares           8.5
Performance-vested awards | Minimum | Award Date February 2018            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   0.00%        
Performance-vested awards | Minimum | Award Date February 2019            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   0.00%        
Performance-vested awards | Minimum | Award Date February 2020            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   0.00%        
Performance-vested awards | Maximum | Award Date February 2018            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   150.00%        
Performance-vested awards | Maximum | Award Date February 2019            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   150.00%        
Performance-vested awards | Maximum | Award Date February 2020            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   150.00%        
OppenheimerFunds | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock consideration (shares) | shares 6.2