Stock-Based Incentive Plans Stock-Based Compensation Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compenation, equity classified awards		$ 11,400,000	$ 9,500,000	$ 13,100,000
Stock-based compenation, liability classified awards		4,900,000	1,100,000	2,100,000
Pre-tax compensation expense		16,300,000	10,600,000	15,200,000
Book tax benefit		(6,200,000)	(4,200,000)	(6,000,000)
Total stock-based compensation expense, net of tax		10,100,000	6,400,000	9,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning	1,318,640	1,523,710	1,659,100
Granted	147,674	233,449	415,804
Excercised	(455,217)	(393,075)	(475,705)
Forfeited	(39,381)	(42,593)	(50,222)
Expired	(13,470)	(2,851)	(25,267)
Outstanding, Ending	958,246	1,318,640	1,523,710	1,659,100
Vested and Expected to Vest	924,500
Exercisable	601,522
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Avg Share Prince, Beginning	$ 32.06	$ 24.90	$ 21.30
Weighted Avg Share Price, Granted	$ 51.63	$ 53.04	$ 31.26
Weighted Avg Share Price, Exercised	$ 20.91	$ 17.11	$ 16.75
Weighted Avg Share Price, Forfeited	$ 46.97	$ 27.89	$ 25.84
Weighted Avg Share Price, Expired	$ 38.64	$ 47.08	$ 44.93
Weighted Avg Share Prince, Ending	$ 39.67	$ 32.06	$ 24.90	$ 21.30
Vested and expected to vest, weighted avg share price	$ 39.29
Exercisable, weighted avg share price	$ 35.57
Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 6 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	6 years 5 months 19 days
Excercisable Weighted Average Remaining Contractual Term	5 years 6 months 7 days
Options, Outstanding, Intrinsic Value	25,355,000
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	24,791,000
Options, Exercisable, Intrinsic Value	18,383,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	15,000,000	14,600,000	12,000,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	9,300,000	6,700,000	8,000,000
Tax Benefit from Stock Options Exercised	6,200,000	6,000,000	2,700,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	6,700,000
Unrecognized Compensation Cost Related to Options, Expected Recognition Period	1 year 8 months 9 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 8,300,000
Unrecognized Compensation Cost Related to Options, Expected Recognition Period	1 year 9 months 4 days