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Stock-Based Compensation Plans Performance Unit Awards (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Compensation expense for the year $ 4.1 $ 3.3 $ 8.5
Unrecognized Compensation 0.3    
Fair Value of Grants in Period 1.0 0.9 1.3
Stock Appreciation Rights (SARs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Granted 789,000 959,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Unrecognized Compensation 0.5    
Fair Value of Grants in Period 0.9 1.0  
Performance Based Restricted Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Non-vested at January 1, 2,641,000 4,218,000 2,307,000
Non-vested at January 1, $ 3.25 $ 3.39 $ 4.20
Granted 998,000 736,000 2,786,000
Granted $ 2.85 $ 2.92 $ 2.95
Vested (479,000) (1,146,000) (838,000)
Vested $ 2.84 $ 3.59 $ 4.16
Forfeited (1,321,000) (1,167,000) (37,000)
Forfeited $ 3.91 $ 3.20 $ 2.99
Non-vested at December 31, $ 2.90 $ 3.25 $ 3.39
Non-vested at December 31, 1,839,000 2,641,000 4,218,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Compensation expense for the year 2.4 0.5 3.9
Tax benefit related to compensation expense (0.9) (0.2) (1.4)
Grant date fair value of awards vested 1.4 4.1 3.5
Unrecognized Compensation 1.3    
Performance Based Cash Unit Award [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Compensation expense for the year $ 1.8 $ 0.1 $ 3.3