Stock Option Plans and Share-Based Compensation Stock option rollforward YTD (Details) (USD $) In Millions, except Share data, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	2,909,000
Common Stock, Capital Shares Reserved for Future Issuance	2,457,760
Options, shares outstanding- Period start			3,143,000
Options, Outstanding, Wtd Avg Exercise Price - Period start			$ 15.82
Options, Shares Granted in Period			241,000
Options, Grants in Period, Wtd Avg Exercise Price			$ 25.43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			(401,000)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price			$ 15.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period			(38,000)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price			$ 16.54
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period			(3,000)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price			$ 22.99
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,810,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 16.61
Options, shares outstanding- Period end			2,942,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 15.08
Options, Outstanding, Wtd Avg Exercise Price - Period end			$ 16.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 11.4	$ 8.3