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Equity (Liability Award Activity) (Details)
12 Months Ended
Dec. 31, 2020
shares
Stock Options  
Summary of performance share activity  
Exercised Shares Liability Awards (2,363,639)
Expired Shares Liability Awards (55,844)
Performance Shares  
Summary of performance share activity  
Shares Outstanding at January 1, 3,945,742
Granted Shares Liability Awards 1,341,997
Forfeited Shares Liability Awards (117,786)
Paid Liability Awards (1,068,099)
Shares Outstanding at December 31, 4,101,854
Vested and expected to vest at December 31, 4,034,096
Restricted Stock Units  
Summary of performance share activity  
Shares Outstanding at January 1, 2,894,428
Granted Shares Liability Awards 1,431,970
Forfeited Shares Liability Awards (178,960)
Paid Liability Awards (1,359,288)
Shares Outstanding at December 31, 2,788,150
Vested and expected to vest at December 31, 2,735,982
Liability Awards Plan | Stock Options  
Summary of performance share activity  
Shares Outstanding at January 1, 501,687
Granted Shares Liability Awards 21,518
Exercised Shares Liability Awards (141,693)
Expired Shares Liability Awards (3,078)
Forfeited Shares Liability Awards 0
Paid Liability Awards 0
Shares Outstanding at December 31, 378,434
Vested and expected to vest at December 31, 377,317
Liability Awards Plan | Performance Shares  
Summary of performance share activity  
Shares Outstanding at January 1, 529,997
Granted Shares Liability Awards 185,251
Exercised Shares Liability Awards 0
Expired Shares Liability Awards 0
Forfeited Shares Liability Awards (33,822)
Paid Liability Awards (166,191)
Shares Outstanding at December 31, 515,235
Vested and expected to vest at December 31, 499,864
Liability Awards Plan | Restricted Stock Units  
Summary of performance share activity  
Shares Outstanding at January 1, 623,095
Granted Shares Liability Awards 319,981
Exercised Shares Liability Awards 0
Expired Shares Liability Awards 0
Forfeited Shares Liability Awards (46,685)
Paid Liability Awards (290,944)
Shares Outstanding at December 31, 605,447
Vested and expected to vest at December 31, 589,494