Share-Based Compensation Plans (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014
Stock Option Plans
Range of exercise price, lower limit (in dollars per share)	$ 24
Range of exercise price, upper limit (in dollars per share)	$ 67
Options Outstanding (in shares)	1,327,412
Options Outstanding, Weighted Average Remaining Contractual Life (In Years)	2 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 49.66
Options Exercisable (in shares)	1,104,999
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 48.43
Range of Exercise Price $24 - $28
Stock Option Plans
Range of exercise price, lower limit (in dollars per share)	$ 24
Range of exercise price, upper limit (in dollars per share)	$ 28
Options Outstanding (in shares)	6,199
Options Outstanding, Weighted Average Remaining Contractual Life (In Years)	6 months
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 25.40
Options Exercisable (in shares)	6,199
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 25.40
Range of Exercise Price $33 - $38
Stock Option Plans
Range of exercise price, lower limit (in dollars per share)	$ 33
Range of exercise price, upper limit (in dollars per share)	$ 38
Options Outstanding (in shares)	152,250
Options Outstanding, Weighted Average Remaining Contractual Life (In Years)	1 year 8 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 34.26
Options Exercisable (in shares)	152,250
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 34.26
Range of Exercise Price $42 - $45
Stock Option Plans
Range of exercise price, lower limit (in dollars per share)	$ 42
Range of exercise price, upper limit (in dollars per share)	$ 45
Options Outstanding (in shares)	402,250
Options Outstanding, Weighted Average Remaining Contractual Life (In Years)	2 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 42.96
Options Exercisable (in shares)	402,250
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 42.96
Range of Exercise Price $55 - $57
Stock Option Plans
Range of exercise price, lower limit (in dollars per share)	$ 55
Range of exercise price, upper limit (in dollars per share)	$ 57
Options Outstanding (in shares)	724,713
Options Outstanding, Weighted Average Remaining Contractual Life (In Years)	2 years 6 months
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 55.97
Options Exercisable (in shares)	502,300
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 56.08
Range of Exercise Price $61 - $67
Stock Option Plans
Range of exercise price, lower limit (in dollars per share)	$ 61
Range of exercise price, upper limit (in dollars per share)	$ 67
Options Outstanding (in shares)	42,000
Options Outstanding, Weighted Average Remaining Contractual Life (In Years)	3 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 64.16
Options Exercisable (in shares)	42,000
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 64.16