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Debt and Credit Facilities - Amended and Restated Senior Secured Credit Facilities (Details)
£ in Millions
6 Months Ended 12 Months Ended
Jul. 12, 2018
USD ($)
Mar. 25, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Aug. 01, 2019
USD ($)
Jul. 12, 2018
GBP (£)
Jul. 11, 2018
USD ($)
Debt Instrument [Line Items]                  
Loss on debt redemption and refinancing activities       $ 16,100,000 $ 1,900,000 $ 0      
Interest expense, net                  
Debt Instrument [Line Items]                  
Amortization expense       $ 1,800,000 $ 3,200,000        
Line of Credit | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Revolving credit facilities                 $ 700,000,000.0
Term Loan A Due 2019                  
Debt Instrument [Line Items]                  
Prepayments of Term Loan A facility due in July 2019   $ 755,200,000 $ 96,300,000            
Term Loan A Facility Due July 2023                  
Debt Instrument [Line Items]                  
Revolving credit facilities             $ 475,000,000    
Debt issuance costs             $ 400,000    
Term Loans $ 186,500,000             £ 29.4  
Third Amended And Restated Credit Agreement | Base Rate | Revolving Credit Facility | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.25%                
Third Amended And Restated Credit Agreement | Base Rate | Revolving Credit Facility | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.00%                
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 and refinancing activities 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