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Subsequent Event (Details) ([IssuanceOfDebtMember], USD $)
In Millions, unless otherwise specified
3 Months Ended
Jun. 30, 2013
[IssuanceOfDebtMember]
 
Subsequent Event [Line Items]  
Subsequent Event Amount $ 500.0
Debt Instrument Interest Rate Stated Percentage 5.875%
Debt Instrument Maturity Date Aug. 15, 2023