v3.26.1
Debt (Summary of Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Feb. 28, 2025
Dec. 31, 2024
Dec. 19, 2023
Mar. 07, 2019
Debt Instrument [Line Items]              
Revolving secured line of credit balance outstanding $ 219.6 $ 107.3          
Secured Debt 5,100.3 5,158.8          
Senior notes balance outstanding 1,088.7 1,087.8          
Restricted cash and cash equivalents pledged as collateral 525.7 477.9 $ 591.8   $ 501.3    
Revolving Secured Line of Credit [Member]              
Debt Instrument [Line Items]              
Revolving secured line of credit balance outstanding 219.6 107.3          
Amount available for borrowing [1] $ 190.4 $ 302.7          
Line of credit facility, interest rate 5.64% 5.69%          
Warehouse Facility II [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 251.0 $ 0.0          
Amount available for borrowing [1] 249.0 500.0          
Loans pledged as collateral 352.3 0.0          
Restricted cash and cash equivalents pledged as collateral $ 5.9 $ 0.0          
Interest rate 5.48% 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 $ 0.0 $ 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 $ 0.1          
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 522.5 523.8          
Restricted cash and cash equivalents pledged as collateral $ 47.8 $ 42.1          
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 110.6 108.8          
Restricted cash and cash equivalents pledged as collateral $ 10.0 $ 8.8          
Interest rate 5.07% 5.95%          
Term ABS 2022-1 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 0.0 $ 44.8          
Loans pledged as collateral 0.0 186.3          
Restricted cash and cash equivalents pledged as collateral $ 0.0 $ 19.7          
Interest rate 0.00% 6.13%          
Term ABS 2022-2 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 300.0 $ 300.0          
Loans pledged as collateral 320.9 325.0          
Restricted cash and cash equivalents pledged as collateral $ 27.4 $ 23.6          
Interest rate 6.09% 6.12%          
Term ABS 2022-3 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 82.0 $ 127.0          
Loans pledged as collateral 205.3 238.8          
Restricted cash and cash equivalents pledged as collateral $ 24.8 $ 23.0          
Interest rate 9.00% 8.84%          
Term ABS 2023-1 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 155.0 $ 209.2          
Loans pledged as collateral 255.7 293.5          
Restricted cash and cash equivalents pledged as collateral $ 29.1 $ 26.9          
Interest rate 7.48% 7.32%          
Term ABS 2023-2 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 183.5 $ 242.7          
Loans pledged as collateral 295.5 338.4          
Restricted cash and cash equivalents pledged as collateral $ 31.8 $ 28.6          
Interest rate 6.91% 6.69%          
Term ABS 2023-3 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 252.4 $ 312.9          
Loans pledged as collateral 326.9 371.3          
Restricted cash and cash equivalents pledged as collateral $ 33.0 $ 30.0          
Interest rate 7.13% 6.99%          
Term ABS 2023-5 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 244.5 $ 294.0          
Loans pledged as collateral 292.9 327.7          
Restricted cash and cash equivalents pledged as collateral $ 31.1 $ 28.9          
Interest rate 6.62% 6.54%          
Term ABS 2024-A [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 200.0 $ 200.0          
Loans pledged as collateral 210.4 211.1          
Restricted cash and cash equivalents pledged as collateral $ 18.9 $ 16.6          
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 561.5 580.2          
Restricted cash and cash equivalents pledged as collateral $ 50.6 $ 44.0          
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 608.8 608.6          
Restricted cash and cash equivalents pledged as collateral $ 50.0 $ 42.9          
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 658.6 668.7          
Restricted cash and cash equivalents pledged as collateral $ 55.7 $ 47.4          
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 335.9 339.9          
Restricted cash and cash equivalents pledged as collateral $ 26.7 $ 22.5          
Interest rate 6.13% 6.13%          
Term ABS 2025-1 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 400.0 $ 400.0          
Loans pledged as collateral 456.3 463.5          
Restricted cash and cash equivalents pledged as collateral $ 37.6 $ 32.1          
Interest rate 5.26% 5.26%          
2026 Senior Notes [Member]              
Debt Instrument [Line Items]              
Interest rate             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 $ 500.0          
Interest rate 6.625% 6.625%   6.625%      
Term ABS 2025-2 [Member]              
Debt Instrument [Line Items]              
Secured Debt $ 500.0 $ 500.0          
Loans pledged as collateral 594.4 689.8          
Restricted cash and cash equivalents pledged as collateral $ 43.6 $ 39.0          
Interest rate 4.77% 4.77%          
[1] Availability may be limited by the amount of assets pledged as collateral.