Stock-Based Compensation Stock-Based Compensation - Stock Based Compensation Table (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	921,412
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,890,634
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	(100,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease)	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(25,667)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	6,666
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period	(6,666)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Net	243
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	(243)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,000,000		921,412
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,958,058		1,890,634
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	831,845
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 23.35		$ 23.36
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 17.92
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 7.10
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 7.26
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	$ 15.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 24.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value	$ 10.89		$ 11.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 4.31
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excrecises in Period, Weighted Average Grant Date Fair Value	$ 3.27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeited in Period, Weighted Average Grant Date Fair Value	$ 3.38
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expired in Period, Weighted Average Grant Date Fair Value	$ 6.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Excercisable, Weighted Average Grant Date Fair Value	$ 10.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 73 days		5 years 164 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2 years 117 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 4.7		$ 6.0
Expiration of 2003 Plan	(828,321)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	3.4
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	11.5
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	6 years 120 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 0.5	$ 0.3

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