Stock-Based Incentive Plans Stock-Based Compensation Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compenation, equity classified awards	$ 9,400,000	$ 9,400,000	$ 11,400,000
Stock-based compenation, liability classified awards	2,400,000	900,000	4,800,000
Pre-tax compensation expense	11,800,000	10,300,000	16,300,000
Book tax benefit	(4,500,000)	(3,900,000)	(6,200,000)
Total stock-based compensation expense, net of tax	7,300,000	6,400,000	10,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning	775,059	958,246	1,318,640
Granted	120,932	81,328	147,674
Excercised	(256,910)	(225,272)	(455,217)
Forfeited	(20,966)	(39,243)	(39,381)
Expired			(13,470)
Outstanding, Ending	618,115	775,059	958,246
Vested and Expected to Vest	600,708
Exercisable	433,793
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Avg Share Prince, Beginning	$ 42.09	$ 39.67	$ 32.06
Weighted Avg Share Price, Granted	$ 81.53	$ 72.28	$ 51.63
Weighted Avg Share Price, Exercised	$ 31.95	$ 40.31	$ 20.91
Weighted Avg Share Price, Forfeited	$ 69.18	$ 55.78	$ 46.97
Weighted Avg Share Price, Expired			$ 38.64
Weighted Avg Share Prince, Ending	$ 53.10	$ 42.09	$ 39.67
Vested and expected to vest, weighted avg share price	$ 52.36
Exercisable, weighted avg share price	$ 44.09
Options, Outstanding, Weighted Average Remaining Contractual Term	6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	5 years 10 months 24 days
Excercisable Weighted Average Remaining Contractual Term	4 years 9 months 18 days
Options, Outstanding, Intrinsic Value	31,200,000
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	30,800,000
Options, Exercisable, Intrinsic Value	25,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	13,200,000	7,500,000	15,000,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	8,200,000	9,100,000	9,300,000
Tax Benefit from Stock Options Exercised	4,300,000	3,700,000	6,200,000
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	3,200,000
Unrecognized Compensation Cost Related to Options, Expected Recognition Period	1 year 4 months 13 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	$ 9,100,000
Unrecognized Compensation Cost Related to Options, Expected Recognition Period	1 year 5 months 26 days