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Borrowings Narrative (Details) - USD ($)
6 Months Ended
May 18, 2017
Jun. 30, 2017
Jun. 30, 2016
Debt Instrument [Line Items]      
Loss on hedging activity   $ (5,310,000) $ (3,244,000)
Senior Notes 2017      
Debt Instrument [Line Items]      
Face amount of debt instrument $ 500,000,000    
Interest rate of senior notes (as a percentage) 4.375% 4.375%  
Unamortized discount $ 1,800,000    
Underwriting fees 4,400,000    
Legal and professional costs 900,000    
Loss on hedging activity $ 5,300,000    
Debt instrument term (in years) 30 years    
Notice period for redemption (in days) 30 days    
Repurchase price as percentage of principal amount of senior notes (as a percentage) 101.00%    
Commercial Paper      
Debt Instrument [Line Items]      
Proceeds related to issuance of notes $ 493,900,000    
Commercial Paper      
Debt Instrument [Line Items]      
Commercial paper maximum term (in days)   90 days  
Commerical paper outstanding   $ 0  
Issued commercial paper     $ 0