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Equity and Long-Term Incentive Plans (Schedule of Restricted Stock Unit Activity) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
2011 Non-Employee Director Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted, number of shares 34,678 32,210
Released/Vested, number of shares (4,566) 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Granted, weighted average fair value per stock unit at date of grant (in dollars per share) $ 54.42 $ 61.38
Released/Vested, weighted average fair value per stock unit at date of grant (in dollars per share) $ 55.90 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Number of Shares [Roll Forward]    
Vested award beginning balance, number of shares 219,656 187,446
Vested award ending balance, number of shares 249,768 219,656
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Weighted Average Grant Date Fair Value [Abstract]    
Vested award beginning balance, weighted average fair value per stock unit at date of grant (in dollars per share) $ 54.40 $ 53.20
Vested award ending balance, weighted average fair value per stock unit at date of grant (in dollars per share) $ 54.38 $ 54.40
Parent Company [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested award, beginning balance, number of shares 881,477 1,120,041
Granted, number of shares 371,673 587,471
Released/Vested, number of shares (410,865) (531,655)
Canceled/Forfeited, number of shares (81,854) (294,380)
Unvested award, ending balance, number of shares 760,431 881,477
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Unvested award beginning balance, weighted average fair value per stock unit at date of grant (in dollars per share) $ 57.49 $ 62.53
Granted, weighted average fair value per stock unit at date of grant (in dollars per share) 61.69 52.76
Released/Vested, weighted average fair value per stock unit at date of grant (in dollars per share) 60.74 66.58
Canceled/Forfeited, weighted average fair value per stock unit at date of grant (in dollars per share) 55.85 59.80
Unvested award ending balance, weighted average fair value per stock unit at date of grant (in dollars per share) $ 57.89 $ 57.49
Parent Company [Member] | Share-based Compensation Award, Tranche Two [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested award, beginning balance, number of shares 2,384,767 1,816,147
Granted, number of shares 582,282 887,807
Released/Vested, number of shares (519,531) (227,852)
Canceled/Forfeited, number of shares (77,617) (91,335)
Unvested award, ending balance, number of shares 2,369,901 2,384,767