Stock-Based Compensation Outstanding Options and SSARs (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 years	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning balance	7,580,000
Incentive shares granted	813,000
Options / SSARs exercised	(18,000)
Options / SSARs cancelled	(58,000)
Ending balance	8,317,000
Options / SSARs outstanding Weighted Average Exercise Price	$ 12.81	$ 13.10
SSARs granted Weighted Average Exercise Price	$ 10.12
Options / SSARs exercised Weighted Average Exercise Price	$ 4.93
Options / SSARs cancelled Weighted Average Exercise Price	$ 14.82
Options / SSARs outstanding Weighted Average Contractual Term (in years)	6.5
Options / SSARs outstanding Aggregate Intrinsic Value (in millions)	$ 5.2
Vested and expected to vest	7,901,000
Vested and expected to vest Aggregate Intrinsic Value (in millions)	4.9
Options / SSARs exercisable	6,144,000
Options / SSARs exercisable Weighted Average Exercise Price	$ 14.94
Options / SSARs exercisable Aggregate Intrinsic Value (in millions)	3.4
Stock Options [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of months for options to vest at an incremental rate of ten percent for directors	3 months
Options and SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Weighted-average period of years costs are expected to be recognied over	1.4
Compensation expense related to award	3.5
Unrecognized compensation costs	$ 0.9
Shares available under stock award plans	4,739,880
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Years SSARs become ratably exercisable over	3 years
Years until SSARs expire	P10Y
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Starting Term When Options Become Exercisable After Grant Date	3 months