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Debt (Narrative) (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Dec. 31, 2023

Dec. 19, 2023

Mar. 07, 2019

Dec. 31, 2022

Sep. 30, 2024

Dec. 18, 2019

Debt Instrument [Line Items]

Maximum hedging reserve

$ 1.0

Unamortized Debt Issuance Costs

$ (36.6)

$ (40.1)

Percentage of collections on newer contributed loans

4.00%

Percentage of collections on contributed loans

6.00%

Monthly servicing fee per financing

6.00%

Monthly servicing fee per newer financings

4.00%

Mortgage note

8.4

^[1]

$ 0.0

Senior notes

989.0

990.8

Loss on extinguishment of debt

$ 1.8

Carrying Amount

5,067.5

6,248.9

Senior Notes [Member]

Debt Instrument [Line Items]

Unamortized Debt Issuance Costs

(11.0)

(9.2)

Carrying Amount

989.0

990.8

Mortgages [Member]

Debt Instrument [Line Items]

Debt facility financing amount

9.0

Unamortized Debt Issuance Costs

0.0

0.0

Mortgage note

$ 8.4

$ 0.0

Senior notes yield to maturity

6.88%

0.00%

Carrying Amount

$ 8.4

$ 0.0

Revolving Secured Line of Credit [Member]

Debt Instrument [Line Items]

Line of credit facility

$ 390.0

Percentage of net book value of loans

80.00%

Unamortized Debt Issuance Costs

^[2]

0.0

$ 0.0

Carrying Amount

^[2]

$ 79.2

$ 1.0

Warehouse Facilities [Member]

Debt Instrument [Line Items]

Percentage of net book value of loans

80.00%

Number of warehouse facilities

5

Debt facility financing amount

$ 1,275.0

Warehouse Facility II [Member]

Debt Instrument [Line Items]

Debt facility financing amount

^[3]

$ 500.0

Debt maturity date

^[3],[4]

Sep. 20, 2027

Senior notes yield to maturity

0.00%

0.00%

Warehouse Facility IV [Member]

Debt Instrument [Line Items]

Debt facility financing amount

^[3]

$ 300.0

Debt maturity date

^[3],[4]

Dec. 29, 2026

Senior notes yield to maturity

0.00%

0.00%

Warehouse Facility V [Member]

Debt Instrument [Line Items]

Debt facility financing amount

^[3]

$ 200.0

Debt maturity date

^[3],[5]

Dec. 29, 2025

Senior notes yield to maturity

0.00%

0.00%

Warehouse Facility VI [Member]

Debt Instrument [Line Items]

Debt facility financing amount

^[3]

$ 75.0

Debt maturity date

^[3],[4]

Sep. 30, 2026

Senior notes yield to maturity

0.00%

0.00%

Term ABS 2019-2 [Member]

Debt Instrument [Line Items]

Debt facility financing amount

^[3]

$ 500.0

Debt maturity date

^[3],[6]

Sep. 15, 2026

Senior notes yield to maturity

5.15%

5.43%

2024 Senior Notes [Member]

Debt Instrument [Line Items]

Debt facility financing amount

$ 400.0

Repayment of senior notes

$ 77.7

$ 322.3

Senior notes yield to maturity

5.125%

2026 Senior Notes [Member]

Debt Instrument [Line Items]

Debt facility financing amount

$ 400.0

$ 400.0

Senior notes stated interest rate

6.625%

Debt maturity date

Mar. 15, 2026

Mar. 15, 2026

Senior notes

$ 400.0

$ 400.0

Senior notes yield to maturity

6.625%

6.625%

2028 Senior Notes [Member]

Debt Instrument [Line Items]

Debt facility financing amount

$ 600.0

$ 600.0

Debt maturity date

Dec. 15, 2028

Senior notes

$ 600.0

$ 600.0

Senior notes yield to maturity

9.25%

9.25%

9.25%

9.25%

[1]	Measured at amortized cost with fair value disclosed.
[2]	Excludes deferred debt issuance costs of $4.8 million and $4.2 million as of September 30, 2024 and December 31, 2023, respectively, which are included in other assets.
[3]	Financing made available only to a specified subsidiary of the Company.
[4]	Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.
[5]	Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on December 27, 2027 will be due on that date.
[6]	Represents the revolving maturity date. The Company has the option to redeem and retire the indebtedness after the revolving maturity date. If we do not elect this option, the outstanding balance will amortize based on the cash flows of the pledged assets

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