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Stock-Based Compensation Outstanding Options and SSARs (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
years
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Beginning balance 8,315,000  
Incentive shares granted 822,000  
Options / SSARs exercised (80,000)  
Options / SSARs cancelled (16,000)  
Ending balance 9,041,000  
Options / SSARs outstanding Weighted Average Exercise Price $ 12.47 $ 12.78
SSARs granted Weighted Average Exercise Price $ 8.84  
Options / SSARs exercised Weighted Average Exercise Price $ 6.97  
Options / SSARs cancelled Weighted Average Exercise Price $ 14.45  
Options / SSARs outstanding Weighted Average Contractual Term (in years) 6.4  
Options / SSARs outstanding Aggregate Intrinsic Value (in millions) $ 16.2  
Vested and expected to vest 8,589,000  
Vested and expected to vest Aggregate Intrinsic Value (in millions) 15.4  
Options / SSARs exercisable 7,276,000  
Options / SSARs exercisable Weighted Average Exercise Price $ 13.36  
Options / SSARs exercisable Aggregate Intrinsic Value (in millions) 14.8  
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  
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 2.1  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost 1.5  
Unrecognized compensation costs $ 5.9  
Shares available under stock award plans 3,400,000  
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