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Borrowing Arrangements Additional Information (Details) - USD ($)
1 Months Ended 6 Months Ended
Jun. 30, 2015
Dec. 31, 2012
Jul. 31, 2015
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 400,000,000
Line of credit facility, additional borrowings available     $ 100,000,000.0
Line of credit facility, expiration date     May 31, 2020
Line of credit facility, outstanding borrowings     $ 0
Senior Notes | Senior Notes due 2020      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 450,000,000    
Debt instrument, stated interest rate 3.125%    
Senior Notes | Senior Notes due 2025      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 300,000,000    
Debt instrument, stated interest rate 4.375%    
Senior Notes | 2015 Senior Notes      
Debt Instrument [Line Items]      
Proceeds from debt, net of issuance costs $ 742,000,000    
Debt instrument, unamortized discount 1,700,000    
Debt issuance cost $ 6,300,000    
Debt issuance redemption discount premium, percentage of principle amount 101.00%    
Debt fair value     754,100,000
Senior Notes | Senior Notes 2017      
Debt Instrument [Line Items]      
Debt instrument, face amount   $ 400,000,000  
Debt instrument, stated interest rate   1.95%  
Senior Notes | Senior Notes 2022      
Debt Instrument [Line Items]      
Debt instrument, face amount   $ 350,000,000  
Debt instrument, stated interest rate   3.60%  
Senior Notes | 2012 Senior Notes      
Debt Instrument [Line Items]      
Proceeds from debt, net of issuance costs   $ 739,300,000  
Debt instrument, unamortized discount   4,500,000  
Debt issuance cost   $ 6,100,000  
Debt issuance redemption discount premium, percentage of principle amount   101.00%  
Debt fair value     $ 747,300,000