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Share-Based Compensation and Capital Stock Summary of Change in Stock-Based Award Activity (Details)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding, beginning balance (in shares) | shares 1,976,326
Granted (in shares) | shares 109,045
Exercised (in shares) | shares (414,116)
Expired (in shares) | shares (2,018)
Forfeited (in shares) | shares (10,095)
Outstanding, ending balance (in shares) | shares 1,659,142
Options exercisable, ending balance (in shares) | shares 1,169,868
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Beginning balance - weighted average exercise price (in dollars per share) | $ / shares $ 50.80
Granted - Weighted average exercise price (in dollars per share) | $ / shares 81.55
Exercised - Weighted average exercise price (in dollars per share) | $ / shares 55.66
Expired - Weighted average exercise price (in dollars per share) | $ / shares 63.47
Forfeited - Weighted average exercise price (in dollars per share) | $ / shares 54.08
Ending balance - weighted average exercise price (in dollars per share) | $ / shares 51.57
Options Exercisable, ending balance - Weighted average exercise price (in dollars per share) | $ / shares $ 47.44
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Roll Forward]  
Weighted Average Remaining Contractual Term - Outstanding, ending balance 4 years
Weighted Average Remaining Contractual Term - Options Exercisable, ending balance 3 years 6 months
Restricted stock  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Outstanding, beginning balance (in shares) | shares 348,876
Restricted share grants (in shares) | shares 72,671
Vested (in shares) | shares (70,450)
Forfeited (in shares) | shares (13,509)
Outstanding, ending balance (in shares) | shares 337,588
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Beginning balance - weighted average grant date fair value (in dollars per share) | $ / shares $ 57.05
Granted - Weighted average grant date fair value (in dollars per share) | $ / shares 81.55
Vested - Weighted average grant date fair value (in dollars per share) | $ / shares 54.94
Forfeited - Weighted average grant date fair value (in dollars per share) | $ / shares 51.67
Ending balance - weighted average grant date fair value (in dollars per share) | $ / shares $ 62.98
Performance Vested Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Outstanding, beginning balance (in shares) | shares 294,204
Restricted share grants (in shares) | shares 93,809
Vested (in shares) | shares (25,232)
Forfeited (in shares) | shares (6,833)
Outstanding, ending balance (in shares) | shares 355,948
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Beginning balance - weighted average grant date fair value (in dollars per share) | $ / shares $ 56.95
Granted - Weighted average grant date fair value (in dollars per share) | $ / shares 81.55
Vested - Weighted average grant date fair value (in dollars per share) | $ / shares 63.47
Forfeited - Weighted average grant date fair value (in dollars per share) | $ / shares 60.42
Ending balance - weighted average grant date fair value (in dollars per share) | $ / shares $ 62.90