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Derivative Financial Instruments - Narrative (Details) - 6 months ended Jun. 30, 2017
$ in Millions
USD ($)
GBP (£)
Net Investment | Facility and 2015 Term Loan    
Derivative [Line Items]    
Borrowings designated as hedge of net investment | £   £ 150,000,000
Interest-rate swap contracts | Maximum    
Derivative [Line Items]    
Estimate change in fair value of derivative for assumption of one percentage point change in the interest rate | $ $ 3  
Cross currency swap | Maximum    
Derivative [Line Items]    
Estimate change in fair value of derivative for assumption of one percentage point change in the interest rate | $ $ 2  
Cross currency swap | Net Investment    
Derivative [Line Items]    
Notional | £   £ 105,000,000