Stock Option Plans and Share-Based Compensation Stock option rollforward YTD (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	1,817,936
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 6.5
Options, shares outstanding- Period start	4,693,000
Options, Outstanding, Wtd Avg Exercise Price - Period start	$ 13.36
Options, Shares Granted in Period	473,000
Options, Grants in Period, Wtd Avg Exercise Price	$ 15.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(362,000)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 8.61
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	(65,000)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 13.71
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	(100,000)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	$ 21.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	3,513,000
Options, shares outstanding- Period end	4,639,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 13.60
Options, Outstanding, Wtd Avg Exercise Price - Period end	$ 13.73
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 8 months 19 days