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Borrowings - Senior Credit Facility (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Feb. 10, 2019
Debt Instrument [Line Items]        
Borrowings under credit facilities $ 70,000,000.0 $ 294,100,000 $ 92,700,000  
Repayments under credit facility 70,000,000.0 329,900,000 56,900,000  
Interest expense 113,300,000 94,000,000.0 82,100,000  
Revolving Credit Facililty        
Debt Instrument [Line Items]        
Borrowing capacity 775,000,000      
Outstanding borrowing $ 0      
Interest rate at end of period 1.35%      
Borrowings under credit facilities   0 0  
Interest expense $ 0 0 $ 0  
Senior Credit Facility Term Loan | Revolving Credit Facililty        
Debt Instrument [Line Items]        
Borrowing capacity       $ 25,000,000
Repayments under credit facility   $ 250,000,000    
Base Rate        
Debt Instrument [Line Items]        
Applicable margin over base rate 0.50%      
LIBOR rate        
Debt Instrument [Line Items]        
Applicable margin over base rate 1.50%