Share-Based Compensation and Capital Stock Summary of Change in Stock-Based Award Activity (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, 2014 - Shares			1,661,952
Granted - Shares	0	0	651,757		200,000
Exercised - Shares	(131,808)	(29,008)	(190,557)		(263,073)
Expired - Shares			0
Forfeited - Shares			(15,990)
Outstanding at September 30, 2014 - Shares	2,107,162	1,800,000	2,107,162		1,800,000
Options exercisable at September 30, 2014 - Shares	1,194,906		1,194,906
Outstanding at January 1, 2014 - Weighted average exercise price (in dollars per share)			$ 26.44
Granted - Weighted average exercise price (in dollars per share)			$ 45.59
Exercised - Weighted average exercise price (in dollars per share)			$ 26.16
Expired - Weighted average exercise price (in dollars per share)			$ 0.00
Forfeited - Weighted average exercise price (in dollars per share)			$ 31.33
Outstanding at September 30, 2014 - Weighted average exercise price (in dollars per share)	$ 32.35		$ 32.35
Options Exercisable at September 30, 2014 - Weighted average exercise price (in dollars per share)	$ 25.15		$ 25.15
Weighted Average Remaining Contractual Term - Outstanding at September 30, 2014			3 years 8 months 12 days
Weighted Average Remaining Contractual Term - Options Exercisable at September 30, 2014			2 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding at January 1, 2014 - Shares			563,345
Granted - shares	2,853	7,646	149,908		223,045
Vested - Shares			(214,818)
Forfeited - Shares	(13,922)	(25)	(18,218)		(27,953)
Outstanding at September 30, 2014 - Shares	480,217		480,217
Outstanding at January 1, 2014 - Weighted average grant date fair value (in dollars per share)			$ 36.64
Granted - Weighted average grant date fair value (in dollars per share)	$ 52.59	$ 39.24	$ 46.58		$ 37.65
Vested - Weighted average grant date fair value (in dollars per share)			$ 35.91
Forfeited - Weighted average grant date fair value (in dollars per share)			$ 38.50
Outstanding at September 30, 2014 - Weighted average grant date fair value (in dollars per share)	$ 40.01		$ 40.01
Performance Vested Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding at January 1, 2014 - Shares			216,342
Granted - shares	0	0	24,678		58,902
Performance-based leveraging - Shares			10,251	[1]	9,192	[1]
Vested - Shares	0	0	(28,886)		(39,816)
Forfeited - Shares	(3,900)	0	(3,900)		0
Outstanding at September 30, 2014 - Shares	218,485		218,485
Outstanding at January 1, 2014 - Weighted average grant date fair value (in dollars per share)			$ 37.34
Granted - Weighted average grant date fair value (in dollars per share)			$ 45.59		$ 36.76
Performance-Based Leveraging - Weighted average grant date fair value (in dollars per share)			$ 41.25	[1]
Vested - Weighted average grant date fair value (in dollars per share)			$ 41.25
Forfeited - Weighted average grant date fair value (in dollars per share)			$ 36.76
Outstanding at September 30, 2014 - Weighted average grant date fair value (in dollars per share)	$ 37.95		$ 37.95

[1] PVRSU units outstanding have been increased by 10,251 units due to the Company exceeding the targeted performance conditions contained in PVRSUs granted in prior periods during the nine months ended September 30, 2014.