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Stock-Based Compensation (Schedule of Other Stock-Based Awards Activity) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / 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, 2018 | shares 102
Granted | shares 54
Vested | shares (64)
Forfeited | shares (17)
Nonvested at December 31, 2018 | shares 75
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, 2018, Weighted-Average Grant-Date Fair Value | $ / shares $ 123.19
Granted, Weighted-Average Grant-Date Fair Value | $ / shares 107.14
Vested, Weighted-Average Grant-Date Fair Value | $ / shares 114.27
Forfeited, Weighted-Average Grant-Date Fair Value | $ / shares 129.47
Nonvested at December 31, 2018, Weighted-Average Grant-Date Fair Value | $ / shares $ 117.99
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, 2018 | shares 1,562
Granted | shares 796
Vested | shares (607)
Forfeited | shares (186)
Nonvested at December 31, 2018 | shares 1,565
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, 2018, Weighted-Average Grant-Date Fair Value | $ / shares $ 123.97
Granted, Weighted-Average Grant-Date Fair Value | $ / shares 106.65
Vested, Weighted-Average Grant-Date Fair Value | $ / shares 113.99
Forfeited, Weighted-Average Grant-Date Fair Value | $ / shares 121.07
Nonvested at December 31, 2018, Weighted-Average Grant-Date Fair Value | $ / shares $ 119.37