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Debt (Summary of Debt) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Dec. 18, 2019
Debt Instrument [Line Items]          
Revolving secured line of credit balance outstanding $ 104.7 $ 2.6      
Secured Debt 3,832.4 3,811.5      
Senior notes balance outstanding 792.5 792.5      
Restricted cash and cash equivalents pledged as collateral 481.1 410.9 $ 538.5 $ 380.2  
Mortgage note [1] 9.4 9.7      
Revolving Secured Line of Credit [Member]          
Debt Instrument [Line Items]          
Revolving secured line of credit balance outstanding 104.7 2.6      
Amount available for borrowing [2] $ 330.3 $ 432.4      
Interest rate 2.33% 1.98%      
Warehouse Facility II [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 201.0 $ 0.0      
Amount available for borrowing [2] 199.0 400.0      
Loans pledged as collateral 272.8 0.0      
Restricted cash and cash equivalents pledged as collateral $ 5.1 $ 1.0      
Interest rate 2.20% 0.00%      
Warehouse Facility IV [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0 $ 0.0      
Amount available for borrowing [2] 300.0 300.0      
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 V [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0 $ 0.0      
Amount available for borrowing [2] 125.0 125.0      
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 [2] 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 [2] 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 2019-1 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 61.0 $ 124.6      
Loans pledged as collateral 244.7 292.4      
Restricted cash and cash equivalents pledged as collateral $ 34.2 $ 31.8      
Interest rate 3.94% 3.86%      
Term ABS 2019-2 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 500.0 $ 500.0      
Loans pledged as collateral 590.6 582.1      
Restricted cash and cash equivalents pledged as collateral $ 60.0 $ 50.7      
Interest rate 3.13% 3.13%      
Term ABS 2019-3 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 247.1 $ 323.9      
Loans pledged as collateral 326.4 382.9      
Restricted cash and cash equivalents pledged as collateral $ 39.3 $ 36.5      
Interest rate 2.64% 2.58%      
Term ABS 2020-1 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 457.4 $ 500.0      
Loans pledged as collateral 562.6 591.6      
Restricted cash and cash equivalents pledged as collateral $ 61.1 $ 51.9      
Interest rate 2.20% 2.18%      
Term ABS 2020-2 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 481.8 $ 481.8      
Loans pledged as collateral 578.3 579.5      
Restricted cash and cash equivalents pledged as collateral $ 60.5 $ 50.1      
Interest rate 1.65% 1.65%      
Term ABS 2020-3 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 600.0 $ 600.0      
Loans pledged as collateral 704.5 688.1      
Restricted cash and cash equivalents pledged as collateral $ 68.4 $ 58.4      
Interest rate 1.44% 1.44%      
Term ABS 2021-1 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 100.0 $ 100.0      
Loans pledged as collateral 135.4 143.7      
Restricted cash and cash equivalents pledged as collateral $ 12.0 $ 10.2      
Interest rate 2.10% 2.10%      
Term ABS 2021-2 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 500.0 $ 500.0      
Loans pledged as collateral 596.8 618.7      
Restricted cash and cash equivalents pledged as collateral $ 56.7 $ 49.2      
Interest rate 1.12% 1.12%      
2024 Senior Notes [Member]          
Debt Instrument [Line Items]          
Senior notes balance outstanding $ 400.0 $ 400.0     $ 400.0
Interest rate 5.125% 5.125%     5.125%
2026 Senior Notes [Member]          
Debt Instrument [Line Items]          
Senior notes balance outstanding $ 400.0 $ 400.0      
Interest rate 6.625% 6.625%      
Mortgages [Member]          
Debt Instrument [Line Items]          
Interest rate 1.73% 1.60%      
Mortgage note $ 9.4 $ 9.7      
Term ABS 2021-3 [Member]          
Debt Instrument [Line Items]          
Secured Debt 450.0 450.0      
Loans pledged as collateral 598.5 619.8      
Restricted cash and cash equivalents pledged as collateral $ 53.8 $ 46.5      
Interest rate 1.14% 1.14%      
Term ABS 2021-4 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 250.1 $ 250.1      
Loans pledged as collateral 280.9 281.2      
Restricted cash and cash equivalents pledged as collateral $ 27.0 $ 22.1      
Interest rate 1.44% 1.44%      
[1] Measured at amortized cost with fair value disclosed.
[2] Availability may be limited by the amount of assets pledged as collateral.