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Debt and Credit Facilities - Amended and Restated Senior Secured Credit Facilities (Details)
£ in Millions
12 Months Ended
Jul. 12, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 01, 2019
USD ($)
Jul. 12, 2018
GBP (£)
Jul. 11, 2018
USD ($)
Debt Instrument [Line Items]              
Loss on debt redemption and refinancing activities   $ 0 $ 16,100,000 $ 1,900,000      
Interest expense, net              
Debt Instrument [Line Items]              
Amortization expense   $ 2,000,000.0 $ 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 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