Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Schedule of Non-vested Awards (Details)

v3.20.4
Share-Based Compensation - Schedule of Non-vested Awards (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested at January 1, 2019, Shares 0.0    
Non-vested at January 1, 2019, Weighted Average Grant Date Fair Value Per Share $ 67.79    
Granted, Shares 100,000    
Grants in Period, Weighted Average Grant Date Fair Value Per Share $ 41.78    
Vested, Shares 0.0    
Vested, Weighted Average Grant Date Fair Value Per Share $ 0    
Forfeited, Shares (0.0)    
Forfeited, Weighted Average Grant Date Fair Value Per Share $ 0    
Non-vested at December 31, 2019, Shares 100,000 0.0  
Non-vested at December 31, 2019, Weighted Average Grant Date Fair Value Per Share $ 41.78 $ 67.79  
Restricted Share Unit And Performance Stock Unit Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested at January 1, 2019, Shares 4,400,000    
Non-vested at January 1, 2019, Weighted Average Grant Date Fair Value Per Share $ 61.68    
Granted, Shares 1,800,000 [1] 1,900,000 2,600,000
Grants in Period, Weighted Average Grant Date Fair Value Per Share $ 53.88 [1] $ 67.47 $ 59.50
Vested, Shares (2,300,000)    
Vested, Weighted Average Grant Date Fair Value Per Share $ 58.49    
Forfeited, Shares (200,000)    
Forfeited, Weighted Average Grant Date Fair Value Per Share $ 58.83    
Non-vested at December 31, 2019, Shares 3,700,000 [2] 4,400,000  
Non-vested at December 31, 2019, Weighted Average Grant Date Fair Value Per Share $ 60.00 [2] $ 61.68  
Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Award, Shares To Be Issued On Maximum Achievement Of Performance Under Target Awards, Maximum 1,000,000.0    
Phantom Unit Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested at January 1, 2019, Shares 100,000    
Granted, Shares 0    
Vested, Shares (100,000)    
Forfeited, Shares (0.0)    
Non-vested at December 31, 2019, Shares 0.0 100,000  
Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Shares 200,000    
[1] This number includes 0.2 million incremental shares of our common stock that were issued based on performance results from previously-granted performance stock unit awards.
[2] This number excludes 1.0 million performance stock units, which represent the incremental number of common units that would be issued if the maximum level of performance under the target awards amount is achieved.