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Debt and Credit Facilities - Amended and Restated Senior Secured Credit Facilities (Details)
£ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jul. 12, 2018
USD ($)
Jul. 12, 2018
GBP (£)
Jul. 11, 2018
USD ($)
Debt Instrument [Line Items]                
Loss on debt redemption $ 1,500,000   $ 0 $ 1,900,000 $ 0      
Interest Expense                
Debt Instrument [Line Items]                
Amortization expense 500,000     2,700,000        
Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Revolving credit facilities               $ 700,000,000
Term Loan A due July 2023                
Debt Instrument [Line Items]                
Term loans           $ 186,500,000 £ 29.4  
Third Amended And Restated Credit Agreement | Minimum                
Debt Instrument [Line Items]                
Debt interest rate           12500.00% 12500.00%  
Third Amended And Restated Credit Agreement | Maximum                
Debt Instrument [Line Items]                
Debt interest rate           20000.00% 20000.00%  
Third Amended And Restated Credit Agreement | Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Revolving credit facilities           $ 1,000,000,000.0    
Loss on debt redemption   $ 1,900,000            
Accelerated amortization of original issuance discount   1,500,000            
Included in debt redemption was non-lender fees incurred   400,000            
Debt issuance lender fees           $ 700,000    
Third Amended And Restated Credit Agreement | Line of Credit | Revolving Credit Facility | Other Assets                
Debt Instrument [Line Items]                
Debt issuance costs capitalized $ 4,900,000 $ 4,900,000   $ 4,900,000