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Long-Term Debt (2013 Senior Notes) (Details) (USD $)
Dec. 17, 2013
Jan. 31, 2012
Debt Instrument [Line Items]    
Percentage of subsidiary owned 100.00% 100.00%
Senior Notes | 2013 Senior Notes
   
Debt Instrument [Line Items]    
Debt instrument, face amount $ 400,000,000.0  
Debt instrument, stated interest rate 5.375%  
Debt issuance costs capitalized $ 7,200,000