Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Details)

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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended
Apr. 30, 2008
Dec. 31, 2011
Jun. 30, 2011
Long-term Debt      
Principal amount $ 750    
Stated interest rate 6.90%    
Debt instrument due date 2018    
Effective interest rate 7.00%    
Discount on debt 5.4    
Debt Instrument, Frequency of Periodic Payment semi-annually    
Offer to repurchase senior notes, percent of principal amount   101.00%  
Fair value   $ 870.5 $ 863.5