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Stock-Based Compensation (Schedule of Other Stock-Based Awards Activity) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / 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, 2017 | shares 111
Granted | shares 73
Vested | shares (72)
Forfeited | shares (10)
Nonvested at December 31, 2017 | shares 102
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, 2017, Weighted-Average Grant-Date Fair Value | $ / shares $ 117.63
Granted, Weighted-Average Grant-Date Fair Value | $ / shares 116.98
Vested, Weighted-Average Grant-Date Fair Value | $ / shares 108.86
Forfeited, Weighted-Average Grant-Date Fair Value | $ / shares 119.08
Nonvested at December 31, 2017, Weighted-Average Grant-Date Fair Value | $ / shares $ 123.19
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, 2017 | shares 1,642
Granted | shares 628
Vested | shares (544)
Forfeited | shares (164)
Nonvested at December 31, 2017 | shares 1,562
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, 2017, Weighted-Average Grant-Date Fair Value | $ / shares $ 116.53
Granted, Weighted-Average Grant-Date Fair Value | $ / shares 131.68
Vested, Weighted-Average Grant-Date Fair Value | $ / shares 112.16
Forfeited, Weighted-Average Grant-Date Fair Value | $ / shares 119.84
Nonvested at December 31, 2017, Weighted-Average Grant-Date Fair Value | $ / shares $ 123.97