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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, 2014
years
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Options / SSARs outstanding at January 1, 2014 6,937,000  
Incentive shares granted 490,000  
Options / SSARs exercised (3,000)  
Options / SSARs cancelled (345,000)  
Options / SSARs outstanding at March 31, 2014 7,079,000  
Options / SSARs outstanding Weighted Average Exercise Price $ 14.18 $ 14.26
SSARs granted Weighted Average Exercise Price $ 18.09  
Options / SSARs exercised Weighted Average Exercise Price $ 15.27  
Options / SSARs cancelled Weighted Average Exercise Price $ 21.31  
Options / SSARs outstanding Weighted Average Contractual Term (in years) 5.3  
Options / SSARs outstanding Aggregate Intrinsic Value (in millions) $ 34.4  
Vested and expected to vest 6,725,000  
Vested and expected to vest Aggregate Intrinsic Value (in millions) 32.6  
Options / SSARs exercisable 6,022,000  
Options / SSARs exercisable Weighted Average Exercise Price $ 13.96  
Options / SSARs exercisable Aggregate Intrinsic Value (in millions) 31.5  
Director [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Starting Term When Options Become Exercisable After Grant Date 3 months  
Employee Stock Option [Member] | Director [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [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, Number of Shares [Roll Forward]    
Weighted-average period of years costs are expected to be recognied over 2 years  
Compensation Expense 0.7  
Unrecognized compensation costs $ 3.4  
Number of Shares Available for Grant 5,200,000  
Stock Appreciation Rights (SARs) [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Vesting Period 3 years