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Equity (Liability Award Activity) (Details)
12 Months Ended
Dec. 31, 2019
shares
Stock Options  
Summary of performance share activity  
Exercised Shares Liability Awards (3,846,478)
Expired Shares Liability Awards (113,847)
Performance Shares  
Summary of performance share activity  
Shares Outstanding at January 1, 4,044,234
Granted Shares Liability Awards 1,645,468
Forfeited Shares Liability Awards (149,114)
Paid Liability Awards (1,594,846)
Shares Outstanding at December 31, 3,945,742
Vested and expected to vest at December 31, 3,872,543
Restricted Stock Units  
Summary of performance share activity  
Shares Outstanding at January 1, 2,946,269
Granted Shares Liability Awards 1,610,594
Forfeited Shares Liability Awards (161,131)
Paid Liability Awards (1,501,304)
Shares Outstanding at December 31, 2,894,428
Vested and expected to vest at December 31, 2,837,658
Liability Awards Plan | Stock Options  
Summary of performance share activity  
Shares Outstanding at January 1, 546,448
Granted Shares Liability Awards 20,750
Exercised Shares Liability Awards (64,437)
Expired Shares Liability Awards (1,074)
Forfeited Shares Liability Awards 0
Paid Liability Awards 0
Shares Outstanding at December 31, 501,687
Vested and expected to vest at December 31, 500,904
Liability Awards Plan | Performance Shares  
Summary of performance share activity  
Shares Outstanding at January 1, 594,599
Granted Shares Liability Awards 201,840
Exercised Shares Liability Awards 0
Expired Shares Liability Awards 0
Forfeited Shares Liability Awards (53,978)
Paid Liability Awards (212,464)
Shares Outstanding at December 31, 529,997
Vested and expected to vest at December 31, 512,752
Liability Awards Plan | Restricted Stock Units  
Summary of performance share activity  
Shares Outstanding at January 1, 669,102
Granted Shares Liability Awards 361,956
Exercised Shares Liability Awards 0
Expired Shares Liability Awards 0
Forfeited Shares Liability Awards (80,115)
Paid Liability Awards (327,848)
Shares Outstanding at December 31, 623,095
Vested and expected to vest at December 31, 605,633