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Borrowings - North American Revolving Credit and Term Loan (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Debt Instrument [Line Items]    
Repurchase of senior notes $ 4,000,000  
Credit Agreement    
Debt Instrument [Line Items]    
Credit agreement consolidated leverage ratio 3.50 3.50
Consolidated senior secured leverage ratio 2.25 2.25
Maximum cash dividends $ 20,000,000  
Credit Agreement | Minimum    
Debt Instrument [Line Items]    
Unused commitment fee   0.30%
Credit Agreement | Maximum    
Debt Instrument [Line Items]    
Unused commitment fee   0.35%
North American Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity 1,500,000,000 $ 1,500,000,000
Unused portion 692,600,000 692,600,000
Current borrowing capacity 70,300,000 70,300,000
Additional borrowing capacity 622,300,000 622,300,000
UK Credit Agreement    
Debt Instrument [Line Items]    
Unused portion 299,700,000 299,700,000
Current borrowing capacity 57,400,000 57,400,000
Additional borrowing capacity $ 242,300,000 $ 242,300,000
Credit agreement consolidated leverage ratio 3.50 3.50
Consolidated senior secured leverage ratio 2.25 2.25
Convertible Senior Notes | Credit Agreement    
Debt Instrument [Line Items]    
Consolidated senior secured leverage ratio 1.60 1.60
Eurodollar Rate | Credit Agreement | Minimum    
Debt Instrument [Line Items]    
Basis spread variable rate   2.00%
Eurodollar Rate | Credit Agreement | Maximum    
Debt Instrument [Line Items]    
Basis spread variable rate   2.25%
Eurodollar Rate | UK Credit Agreement | Maximum    
Debt Instrument [Line Items]    
Basis spread variable rate   2.50%
Interest Rate Floor    
Debt Instrument [Line Items]    
Basis spread variable rate   0.00%
Line of Credit | Line of Credit    
Debt Instrument [Line Items]    
Long-term debt $ 442,500,000 $ 442,500,000
Revolving Credit Facility | North American Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity 1,000,000,000 1,000,000,000
Line of credit facility, optional increase in borrowing capacity 500,000,000 500,000,000
Line of credit facility, option for letters of credit 25,000,000 25,000,000
Line of credit facility, option to reduce borrowing capacity 25,000,000 25,000,000
Revolving Credit Facility | Line of Credit | UK Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity 800,000,000 800,000,000
Line of credit facility, optional increase in borrowing capacity $ 200,000,000 $ 200,000,000
Revolving Credit Facility | Line of Credit | UK Credit Agreement | Minimum    
Debt Instrument [Line Items]    
Unused commitment fee   0.30%
Consolidated senior secured leverage ratio 1.60 1.60
Revolving Credit Facility | Line of Credit | UK Credit Agreement | Maximum    
Debt Instrument [Line Items]    
Basis spread variable rate   2.75%
Unused commitment fee   0.35%
Canadian Revolving Credit Facility | North American Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 75,000,000 $ 75,000,000
Eligible Core Asset Pool | Credit Agreement    
Debt Instrument [Line Items]    
Percentage of maximum level of borrowings of ERC of eligible asset pools 35.00%  
Eligible Core Asset Pool | UK Credit Agreement    
Debt Instrument [Line Items]    
Percentage of maximum level of borrowings of ERC of eligible asset pools 35.00%  
Eligible Insolvent Asset Pool | Credit Agreement    
Debt Instrument [Line Items]    
Percentage of maximum level of borrowings of ERC of insolvent asset pools 55.00%  
Eligible Insolvent Asset Pool | UK Credit Agreement    
Debt Instrument [Line Items]    
Percentage of maximum level of borrowings of ERC of insolvent asset pools 55.00%