Share-Based Compensation and Capital Stock - Range Of Exercise Prices (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding at December 31, 2016 | shares	2,193,502
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 7 months 13 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 48.26
Options Exercisable, Number Exercisable at December 31, 2016 | shares	816,969
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 40.75
Range 2
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	24.38
Exercise price range, upper range limit (in dollars per share)	$ 29.25
Options Outstanding, Number Outstanding at December 31, 2016 | shares	154,880
Options Outstanding, Weighted Average Remaining Contractual Life	2 years 1 month 20 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 27.03
Options Exercisable, Number Exercisable at December 31, 2016 | shares	154,880
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 27.03
Range 3
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	29.26
Exercise price range, upper range limit (in dollars per share)	$ 34.12
Options Outstanding, Number Outstanding at December 31, 2016 | shares	144,696
Options Outstanding, Weighted Average Remaining Contractual Life	1 year 1 month 20 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 31.31
Options Exercisable, Number Exercisable at December 31, 2016 | shares	144,696
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 31.31
Range 4
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	34.13
Exercise price range, upper range limit (in dollars per share)	$ 39.00
Options Outstanding, Number Outstanding at December 31, 2016 | shares	154,537
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 1 month 9 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 36.76
Options Exercisable, Number Exercisable at December 31, 2016 | shares	115,893
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 36.76
Range 5
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	39.01
Exercise price range, upper range limit (in dollars per share)	$ 43.87
Options Outstanding, Number Outstanding at December 31, 2016 | shares	0
Options Outstanding, Weighted Average Remaining Contractual Life	0 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 0.00
Options Exercisable, Number Exercisable at December 31, 2016 | shares	0
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 0.00
Range 6
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	43.88
Exercise price range, upper range limit (in dollars per share)	$ 48.75
Options Outstanding, Number Outstanding at December 31, 2016 | shares	582,017
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 2 months 27 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 45.59
Options Exercisable, Number Exercisable at December 31, 2016 | shares	289,114
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 45.59
Range 7
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	48.76
Exercise price range, upper range limit (in dollars per share)	$ 65.00
Options Outstanding, Number Outstanding at December 31, 2016 | shares	1,157,372
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 9 months 7 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 56.09
Options Exercisable, Number Exercisable at December 31, 2016 | shares	112,386
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 63.47