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Stock-Based Compensation (Schedule of Other Stock-Based Awards Activity) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Time-Vested Restricted Share Units  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares  
Nonvested at January 1, 2019 | shares 182
Granted | shares 335
Vested | shares (94)
Forfeited | shares (30)
Nonvested at December 31, 2019 | shares 393
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value  
Nonvested at January 1, 2019, Weighted-Average Grant-Date Fair Value | $ / shares $ 130.91
Granted, Weighted-Average Grant-Date Fair Value | $ / shares 131.37
Vested, Weighted-Average Grant-Date Fair Value | $ / shares 127.03
Forfeited, Weighted-Average Grant-Date Fair Value | $ / shares 134.37
Nonvested at December 31, 2019, Weighted-Average Grant-Date Fair Value | $ / shares $ 131.85
Performance-based restricted share units  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares  
Nonvested at January 1, 2019 | shares 1,537
Granted | shares 608
Vested | shares (592)
Forfeited | shares (143)
Nonvested at December 31, 2019 | shares 1,410
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value  
Nonvested at January 1, 2019, Weighted-Average Grant-Date Fair Value | $ / shares $ 122.56
Granted, Weighted-Average Grant-Date Fair Value | $ / shares 131.46
Vested, Weighted-Average Grant-Date Fair Value | $ / shares 108.74
Forfeited, Weighted-Average Grant-Date Fair Value | $ / shares 128.60
Nonvested at December 31, 2019, Weighted-Average Grant-Date Fair Value | $ / shares $ 131.03