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Subsequent Events Subsequent Events (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2013
Apr. 25, 2013
Amendment to Credit Facility [Member]
Revolving Credit Facility [Member]
Mar. 31, 2013
Amendment to Credit Facility [Member]
Revolving Credit Facility [Member]
Mar. 31, 2013
Mandatorily Redeemable Convertible Preferred Stock [Member]
Apr. 02, 2013
Mandatorily Redeemable Convertible Preferred Stock [Member]
Preferred Stock Conversion [Member]
Subsequent Event [Line Items]          
Preferred stock, shares authorized 40,000,000        
Issuance of preferred stock       20,000  
Preferred stock, liquidation value, per share       $ 10  
Preferred stock, convertible to common stock, conversion ratio       1  
Preferred stock converted to common shares         20,000
Revolving credit facility, maximum borrowing capacity $ 105 $ 125 $ 105    
Decrease in basis spread on variable rate   0.50%      
Subordinated debt, maximum issuance authorized (amount)   100      
Repurchase of share-based awards, maximum value authorized   $ 15