Stock-Based Compensation (Details) (2010 Omnibus Incentive Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)	7,000,000
Number of additional shares authorized for issuance (in shares)			3,200,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	Vesting for the options is performance based, with the options vesting in two installments if the Company's earnings per share equal or exceed the two established performance levels, measured in terms of diluted earnings per share. Fifty percent of the options vest upon earnings per share meeting or exceeding the first performance level and fifty percent of the options vest upon earnings per share meeting or exceeding the second performance level.
Fair Value Assumptions and Methodology [Abstract]
Weighted average grant date fair value of grants (in dollars per share)	$ 23.01		$ 22.10		$ 13.31
Risk-free interest rate (in hundredths)	1.70%	[1]	1.40%	[1]	0.80%	[1]
Dividend yield (in hundredths)	1.90%	[2]	3.10%	[2]	2.70%	[2]
Expected volatility (in hundredths)	45.40%	[3]	41.70%	[3]	46.80%	[3]
Expected life in months	62 months	[4]	58 months	[4]	63 months	[4]
Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares)	6,642,900
Granted (in shares)	159,400
Exercised (in shares)	(751,200)
Forfeited/cancelled/expired (in shares)	(88,600)
Outstanding, Ending (in shares)	5,962,500		6,642,900
Exercisable (in shares)	3,077,700
Weighted-average Exercise Price [Abstract]
Outstanding, beginning balance (in dollars per share)	$ 47.10
Granted (in dollars per share)	$ 65.55
Exercised (in dollars per share)	$ 20.86
Forfeited/cancelled/expired (in dollars per share)	$ 78.10
Outstanding, Ending (in dollars per share)	$ 50.43		$ 47.10
Exercisable (in dollars per share)	$ 25.95
Outstanding options, weighted-average remaining contractual term	3 years 10 months 10 days
Exercisable options, weighted-average remaining contractual term	2 years 3 months 11 days
Aggregate intrinsic value	$ 58,657,000
Aggregate intrinsic value, exercisable	57,989,000
Total fair value of options vested and expensed, net of tax	4,200,000
Cash proceeds from stock options exercised	11,100,000		37,900,000		8,000,000
Tax benefit realized for stock options exercised	11,900,000		41,900,000		6,300,000
Intrinsic value of stock options exercised	17,200,000		241,700,000		10,600,000
Weighted-average Grant Date Fair Value [Abstract]
Granted (in dollars per share)	$ 65.55
Unrecognized stock-based compensation expense	16,900,000
Unrecognized stock-based compensation expense, period for recognition	4 years
Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of stock options granted (in years)	7 years
Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of stock options granted (in years)	10 years
Service-Based Options [Member]
Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares)	2,159,800
Granted (in shares)	90,600
Exercised (in shares)	(326,200)
Forfeited/cancelled/expired (in shares)	0
Outstanding, Ending (in shares)	1,924,200
Exercisable (in shares)	1,618,500
Weighted-average Exercise Price [Abstract]
Outstanding, beginning balance (in dollars per share)	$ 26.01
Granted (in dollars per share)	$ 65.43
Exercised (in dollars per share)	$ 18.83
Forfeited/cancelled/expired (in dollars per share)	$ 0
Outstanding, Ending (in dollars per share)	$ 29.08
Exercisable (in dollars per share)	$ 21.22
Outstanding options, weighted-average remaining contractual term	2 years 3 months 22 days
Exercisable options, weighted-average remaining contractual term	1 year 8 months 12 days
Aggregate intrinsic value	39,897,000
Aggregate intrinsic value, exercisable	39,310,000
Weighted-average Grant Date Fair Value [Abstract]
Granted (in dollars per share)	$ 65.43
Performance-Based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	Vesting for the options is performance based, with the options vesting in three installments if the Company's earnings per share equal or exceed the three established performance levels, measured in terms of diluted earnings per share. One third of the options will vest upon earnings per share meeting or exceeding the first performance level, one third of the options will vest upon earnings per share meeting or exceeding the second performance level and one third of the options will vest upon earnings per share meeting or exceeding the third performance level.
Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares)	4,483,100
Granted (in shares)	68,800
Exercised (in shares)	(425,000)
Forfeited/cancelled/expired (in shares)	(88,600)
Outstanding, Ending (in shares)	4,038,300
Exercisable (in shares)	1,459,200
Weighted-average Exercise Price [Abstract]
Outstanding, beginning balance (in dollars per share)	$ 57.25
Granted (in dollars per share)	$ 65.70
Exercised (in dollars per share)	$ 22.42
Forfeited/cancelled/expired (in dollars per share)	$ 78.10
Outstanding, Ending (in dollars per share)	$ 60.61
Exercisable (in dollars per share)	$ 31.21
Outstanding options, weighted-average remaining contractual term	4 years 7 months 6 days
Exercisable options, weighted-average remaining contractual term	2 years 11 months 1 day
Aggregate intrinsic value	18,790,000
Aggregate intrinsic value, exercisable	18,680,000
Weighted-average Grant Date Fair Value [Abstract]
Granted (in dollars per share)	$ 65.70
Non-Vested Restricted Stock [Member]
Weighted-average Exercise Price [Abstract]
Granted (in dollars per share)	$ 82.66
Number of shares [Roll forward]
Nonvested, beginning balance (in shares)	729,600
Granted (in shares)	289,900
Vested (in shares)	(325,800)
Forfeited (in shares)	(19,900)
Nonvested, Ending Balance (in shares)	673,800
Weighted-average Grant Date Fair Value [Abstract]
Nonvested, beginning balance (in dollars per share)	$ 42.48
Granted (in dollars per share)	$ 82.66
Vested (in dollars per share)	$ 40.74
Forfeited (in dollars per share)	$ 58.55
Nonvested, Ending Balance (in dollars per share)	$ 60.14
Unrecognized stock-based compensation expense	$ 19,900,000
Unrecognized stock-based compensation expense, period for recognition	2 years 8 months 12 days

[1] The risk-free interest rate is based upon the rate on a zero coupon U.S. Treasury bill, for periods within the contractual life of the option, in effect at the time of the grant.

[2] The dividend yield is based on the average of historical stock prices and actual dividends paid.

[3] Expected volatility is based on the historical volatility of the Company's stock price, over a period similar to the expected life of the option.

[4] The expected term of the option is based on the historical employee exercise behavior, the vesting terms of the respective option, and a contractual life of either seven or ten years.