v3.25.2
Debt (Summary of Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Feb. 28, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Dec. 19, 2023
Mar. 07, 2019
Debt Instrument [Line Items]              
Revolving secured line of credit balance outstanding $ 1.5   $ 0.1        
Secured Debt 5,383.3   5,361.5        
Senior notes balance outstanding 1,086.4   991.3        
Restricted cash and cash equivalents pledged as collateral 493.8   501.3 $ 509.3 $ 457.7    
Revolving Secured Line of Credit [Member]              
Debt Instrument [Line Items]              
Revolving secured line of credit balance outstanding 1.5   0.1        
Amount available for borrowing [1] $ 408.5   $ 409.9        
Interest rate 6.26%   6.37%        
Warehouse Facility II [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 0.0   $ 0.0        
Amount available for borrowing [1] 500.0   500.0        
Loans pledged as collateral 0.0   0.0        
Restricted cash and cash equivalents pledged as collateral $ 0.0   $ 2.5        
Interest rate 0.00%   0.00%        
Warehouse Facility IV [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 0.0   $ 0.0        
Amount available for borrowing [1] 300.0   300.0        
Loans pledged as collateral 0.0   0.0        
Restricted cash and cash equivalents pledged as collateral $ 0.0   $ 0.0        
Interest rate 0.00%   0.00%        
Warehouse Facility V [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 0.0   $ 0.0        
Amount available for borrowing [1] 250.0   250.0        
Loans pledged as collateral 0.0   0.0        
Restricted cash and cash equivalents pledged as collateral $ 1.0   $ 1.0        
Interest rate 0.00%   0.00%        
Warehouse Facility VI [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 0.0   $ 0.0        
Amount available for borrowing [1] 75.0   75.0        
Loans pledged as collateral 0.0   0.0        
Restricted cash and cash equivalents pledged as collateral $ 0.0   $ 0.0        
Interest rate 0.00%   0.00%        
Warehouse Facility VIII [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 0.0   $ 0.0        
Amount available for borrowing [1] 200.0   200.0        
Loans pledged as collateral 0.0   0.0        
Restricted cash and cash equivalents pledged as collateral $ 0.0   $ 0.0        
Interest rate 0.00%   0.00%        
Term ABS 2019-2 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 500.0   $ 500.0        
Loans pledged as collateral 525.0   529.0        
Restricted cash and cash equivalents pledged as collateral $ 43.1   $ 41.7        
Interest rate 5.43%   5.43%        
Term ABS 2021-1 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 100.0   $ 100.0        
Loans pledged as collateral 108.4   112.0        
Restricted cash and cash equivalents pledged as collateral $ 9.2   $ 8.7        
Interest rate 6.51%   6.60%        
Term ABS 2021-4 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 0.0   $ 63.6        
Loans pledged as collateral 0.0   167.0        
Restricted cash and cash equivalents pledged as collateral $ 0.0   $ 16.4        
Interest rate 0.00%   1.89%        
Term ABS 2022-1 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 131.6   $ 236.6        
Loans pledged as collateral 244.5   310.0        
Restricted cash and cash equivalents pledged as collateral $ 22.9   $ 24.9        
Interest rate 5.67%   5.24%        
Term ABS 2022-2 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 300.0   $ 300.0        
Loans pledged as collateral 353.1   406.0        
Restricted cash and cash equivalents pledged as collateral $ 25.2   $ 25.2        
Interest rate 6.75%   7.29%        
Term ABS 2022-3 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 227.0   $ 347.6        
Loans pledged as collateral 311.0   395.2        
Restricted cash and cash equivalents pledged as collateral $ 26.8   $ 29.1        
Interest rate 8.43%   7.82%        
Term ABS 2023-1 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 329.6   $ 400.0        
Loans pledged as collateral 376.9   453.0        
Restricted cash and cash equivalents pledged as collateral $ 31.5   $ 33.1        
Interest rate 7.01%   6.92%        
Term ABS 2023-2 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 374.8   $ 400.0        
Loans pledged as collateral 430.8   533.3        
Restricted cash and cash equivalents pledged as collateral $ 33.9   $ 36.8        
Interest rate 6.42%   6.39%        
Term ABS 2023-3 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 400.0   $ 400.0        
Loans pledged as collateral 429.7   524.9        
Restricted cash and cash equivalents pledged as collateral $ 34.5   $ 36.5        
Interest rate 6.86%   6.86%        
Term ABS 2023-A [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 200.0   $ 200.0        
Loans pledged as collateral 216.3   252.0        
Restricted cash and cash equivalents pledged as collateral $ 17.1   $ 17.7        
Interest rate 7.51%   7.51%        
Term ABS 2023-5 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 294.0   $ 294.0        
Loans pledged as collateral 330.3   398.7        
Restricted cash and cash equivalents pledged as collateral $ 31.2   $ 32.9        
Interest rate 6.54%   6.54%        
Term ABS 2024-A [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 200.0   $ 200.0        
Loans pledged as collateral 211.3   248.4        
Restricted cash and cash equivalents pledged as collateral $ 17.5   $ 18.1        
Interest rate 7.45%   7.45%        
Term ABS 2024-1 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 500.0   $ 500.0        
Loans pledged as collateral 589.0   553.3        
Restricted cash and cash equivalents pledged as collateral $ 47.4   $ 45.0        
Interest rate 6.01%   6.01%        
Term ABS 2024-2 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 550.0   $ 550.0        
Loans pledged as collateral 605.6   646.8        
Restricted cash and cash equivalents pledged as collateral $ 43.7   $ 42.0        
Interest rate 6.21%   6.21%        
Term ABS 2024-3 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 600.0   $ 600.0        
Loans pledged as collateral 668.3   700.9        
Restricted cash and cash equivalents pledged as collateral $ 49.9   $ 51.5        
Interest rate 4.91%   4.91%        
Term ABS 2024-B [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 300.0   $ 300.0        
Loans pledged as collateral 353.0   425.8        
Restricted cash and cash equivalents pledged as collateral $ 23.3   $ 37.9        
Interest rate 6.13%   6.13%        
Term ABS 2025-1 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 400.0            
Loans pledged as collateral 476.8   $ 0.0        
Restricted cash and cash equivalents pledged as collateral $ 34.8            
Interest rate 5.26%            
2026 Senior Notes [Member]              
Debt Instrument [Line Items]              
Senior notes balance outstanding $ 0.0   $ 400.0        
Interest rate 0.00%   6.625%       6.625%
2028 Senior Notes [Member]              
Debt Instrument [Line Items]              
Senior notes balance outstanding $ 600.0   $ 600.0        
Interest rate 9.25%   9.25%     9.25%  
2030 Senior Notes [Member]              
Debt Instrument [Line Items]              
Senior notes balance outstanding $ 500.0   $ 0.0        
Interest rate 6.625% 6.625% 0.00%        
[1] Availability may be limited by the amount of assets pledged as collateral.