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Loans Receivable (Summary of Changes in Loans Receivable and Allowance for Credit Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Loans and Leases Receivable, Net [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | $ (7,345.6) | $ (6,500.3) | $ (6,955.3) | $ (6,297.7)
Finance Charges Revenue |  | (497.7) | (441.0) | (966.9) | (862.1)
Provision for credit losses |  | (320.6) | (250.5) | (506.6) | (387.9)
New Consumer Loan Assignments | [1] | 1,228.5 | 1,056.0 | 2,545.5 | 2,151.3
Proceeds from Collection of Loans Receivable | [2] | (1,291.5) | (1,214.7) | (2,585.2) | (2,461.7)
Accelerated Payments of Dealer Holdback |  | 18.3 | 13.8 | 33.4 | 24.6
Payments of Dealer Holdback |  | 65.6 | 61.1 | 130.5 | 118.3
Loans And Leases Receivable Transfers | [3] | 0.0 | 0.0 | 0.0 | 0.0
Allowance for Loan and Lease Losses, Write-offs |  | 0.0 | 0.0 | 0.0 | 0.0
Recoveries | [4] | 0.0 | 0.0 | 0.0 | 0.0
Deferral of Loan Origination Costs |  | 4.1 | 3.3 | 7.9 | 5.9
Balance, end of period |  | (7,547.7) | (6,610.3) | (7,547.7) | (6,610.3)
Dealer Loans [Member] |  |  |  |  |
Loans and Leases Receivable, Net [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | (5,081.8) | (4,241.2) | (4,709.8) | (4,074.8)
Finance Charges Revenue |  | (316.5) | (259.4) | (606.8) | (505.1)
Provision for credit losses |  | (212.3) | (144.6) | (334.0) | (219.3)
New Consumer Loan Assignments | [1] | 949.7 | 724.5 | 1,959.1 | 1,470.4
Proceeds from Collection of Loans Receivable | [2] | (879.0) | (792.9) | (1,743.9) | (1,601.5)
Accelerated Payments of Dealer Holdback |  | 18.3 | 13.8 | 33.4 | 24.6
Payments of Dealer Holdback |  | 65.6 | 61.1 | 130.5 | 118.3
Loans And Leases Receivable Transfers | [3] | (23.6) | (20.1) | (48.5) | (32.6)
Allowance for Loan and Lease Losses, Write-offs |  | 0.0 | 0.0 | 0.0 | 0.0
Recoveries | [4] | 0.0 | 0.0 | 0.0 | 0.0
Deferral of Loan Origination Costs |  | 4.1 | 3.3 | 7.9 | 5.9
Balance, end of period |  | (5,321.1) | (4,345.7) | (5,321.1) | (4,345.7)
Purchased Loans [Member] |  |  |  |  |
Loans and Leases Receivable, Net [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | (2,263.8) | (2,259.1) | (2,245.5) | (2,222.9)
Finance Charges Revenue |  | (181.2) | (181.6) | (360.1) | (357.0)
Provision for credit losses |  | (108.3) | (105.9) | (172.6) | (168.6)
New Consumer Loan Assignments | [1] | 278.8 | 331.5 | 586.4 | 680.9
Proceeds from Collection of Loans Receivable | [2] | (412.5) | (421.8) | (841.3) | (860.2)
Accelerated Payments of Dealer Holdback |  | 0.0 | 0.0 | 0.0 | 0.0
Payments of Dealer Holdback |  | 0.0 | 0.0 | 0.0 | 0.0
Loans And Leases Receivable Transfers | [3] | (23.6) | (20.1) | (48.5) | (32.6)
Allowance for Loan and Lease Losses, Write-offs |  | 0.0 | 0.0 | 0.0 | 0.0
Recoveries | [4] | 0.0 | 0.0 | 0.0 | 0.0
Deferral of Loan Origination Costs |  | 0.0 | 0.0 | 0.0 | 0.0
Balance, end of period |  | (2,226.6) | (2,264.6) | (2,226.6) | (2,264.6)
Loans Receivable [Member] |  |  |  |  |
Loans and Leases Receivable, Net [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | (10,483.5) | (9,384.3) | (10,020.1) | (9,165.5)
Finance Charges Revenue |  | (702.5) | (623.4) | (1,369.0) | (1,222.8)
Provision for credit losses |  | 0.0 | 0.0 | 0.0 | 0.0
New Consumer Loan Assignments | [1] | 1,228.5 | 1,056.0 | 2,545.5 | 2,151.3
Proceeds from Collection of Loans Receivable | [2] | (1,291.5) | (1,214.7) | (2,585.2) | (2,461.7)
Accelerated Payments of Dealer Holdback |  | 18.3 | 13.8 | 33.4 | 24.6
Payments of Dealer Holdback |  | 65.6 | 61.1 | 130.5 | 118.3
Loans And Leases Receivable Transfers | [3] | 0.0 | 0.0 | 0.0 | 0.0
Allowance for Loan and Lease Losses, Write-offs |  | (329.0) | (329.4) | (640.4) | (630.0)
Recoveries | [4] | (2.2) | (1.8) | (3.4) | (2.9)
Deferral of Loan Origination Costs |  | 4.1 | 3.3 | 7.9 | 5.9
Balance, end of period |  | (10,884.2) | (9,599.6) | (10,884.2) | (9,599.6)
Loans Receivable [Member] | Dealer Loans [Member] |  |  |  |  |
Loans and Leases Receivable, Net [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | (7,553.0) | (6,314.4) | (7,065.5) | (6,074.8)
Finance Charges Revenue |  | (473.5) | (387.5) | (912.0) | (755.8)
Provision for credit losses |  | 0.0 | 0.0 | 0.0 | 0.0
New Consumer Loan Assignments | [1] | 949.7 | 724.5 | 1,959.1 | 1,470.4
Proceeds from Collection of Loans Receivable | [2] | (879.0) | (792.9) | (1,743.9) | (1,601.5)
Accelerated Payments of Dealer Holdback |  | 18.3 | 13.8 | 33.4 | 24.6
Payments of Dealer Holdback |  | 65.6 | 61.1 | 130.5 | 118.3
Loans And Leases Receivable Transfers | [3] | (34.5) | (32.4) | (71.4) | (51.6)
Allowance for Loan and Lease Losses, Write-offs |  | (171.2) | (145.8) | (314.0) | (263.5)
Recoveries | [4] | (1.1) | (0.6) | (1.5) | (0.9)
Deferral of Loan Origination Costs |  | 4.1 | 3.3 | 7.9 | 5.9
Balance, end of period |  | (7,980.6) | (6,534.1) | (7,980.6) | (6,534.1)
Loans Receivable [Member] | Purchased Loans [Member] |  |  |  |  |
Loans and Leases Receivable, Net [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | (2,930.5) | (3,069.9) | (2,954.6) | (3,090.7)
Finance Charges Revenue |  | (229.0) | (235.9) | (457.0) | (467.0)
Provision for credit losses |  | 0.0 | 0.0 | 0.0 | 0.0
New Consumer Loan Assignments | [1] | 278.8 | 331.5 | 586.4 | 680.9
Proceeds from Collection of Loans Receivable | [2] | (412.5) | (421.8) | (841.3) | (860.2)
Accelerated Payments of Dealer Holdback |  | 0.0 | 0.0 | 0.0 | 0.0
Payments of Dealer Holdback |  | 0.0 | 0.0 | 0.0 | 0.0
Loans And Leases Receivable Transfers | [3] | (34.5) | (32.4) | (71.4) | (51.6)
Allowance for Loan and Lease Losses, Write-offs |  | (157.8) | (183.6) | (326.4) | (366.5)
Recoveries | [4] | (1.1) | (1.2) | (1.9) | (2.0)
Deferral of Loan Origination Costs |  | 0.0 | 0.0 | 0.0 | 0.0
Balance, end of period |  | (2,903.6) | (3,065.5) | (2,903.6) | (3,065.5)
Allowance for Credit Losses [Member] |  |  |  |  |
Loans and Leases Receivable, Net [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | (3,137.9) | (2,884.0) | (3,064.8) | (2,867.8)
Finance Charges Revenue |  | (204.8) | (182.4) | (402.1) | (360.7)
Provision for credit losses |  | (320.6) | (250.5) | (506.6) | (387.9)
New Consumer Loan Assignments | [1] | 0.0 | 0.0 | 0.0 | 0.0
Proceeds from Collection of Loans Receivable | [2] | 0.0 | 0.0 | 0.0 | 0.0
Accelerated Payments of Dealer Holdback |  | 0.0 | 0.0 | 0.0 | 0.0
Payments of Dealer Holdback |  | 0.0 | 0.0 | 0.0 | 0.0
Loans And Leases Receivable Transfers | [3] | 0.0 | 0.0 | 0.0 | 0.0
Allowance for Loan and Lease Losses, Write-offs |  | (329.0) | (329.4) | (640.4) | (630.0)
Recoveries | [4] | (2.2) | (1.8) | (3.4) | (2.9)
Deferral of Loan Origination Costs |  | 0.0 | 0.0 | 0.0 | 0.0
Balance, end of period |  | (3,336.5) | (2,989.3) | (3,336.5) | (2,989.3)
Allowance for Credit Losses [Member] | Dealer Loans [Member] |  |  |  |  |
Loans and Leases Receivable, Net [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | (2,471.2) | (2,073.2) | (2,355.7) | (2,000.0)
Finance Charges Revenue |  | (157.0) | (128.1) | (305.2) | (250.7)
Provision for credit losses |  | (212.3) | (144.6) | (334.0) | (219.3)
New Consumer Loan Assignments | [1] | 0.0 | 0.0 | 0.0 | 0.0
Proceeds from Collection of Loans Receivable | [2] | 0.0 | 0.0 | 0.0 | 0.0
Accelerated Payments of Dealer Holdback |  | 0.0 | 0.0 | 0.0 | 0.0
Payments of Dealer Holdback |  | 0.0 | 0.0 | 0.0 | 0.0
Loans And Leases Receivable Transfers | [3] | (10.9) | (12.3) | (22.9) | (19.0)
Allowance for Loan and Lease Losses, Write-offs |  | (171.2) | (145.8) | (314.0) | (263.5)
Recoveries | [4] | (1.1) | (0.6) | (1.5) | (0.9)
Deferral of Loan Origination Costs |  | 0.0 | 0.0 | 0.0 | 0.0
Balance, end of period |  | (2,659.5) | (2,188.4) | (2,659.5) | (2,188.4)
Allowance for Credit Losses [Member] | Purchased Loans [Member] |  |  |  |  |
Loans and Leases Receivable, Net [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | (666.7) | (810.8) | (709.1) | (867.8)
Finance Charges Revenue |  | (47.8) | (54.3) | (96.9) | (110.0)
Provision for credit losses |  | (108.3) | (105.9) | (172.6) | (168.6)
New Consumer Loan Assignments | [1] | 0.0 | 0.0 | 0.0 | 0.0
Proceeds from Collection of Loans Receivable | [2] | 0.0 | 0.0 | 0.0 | 0.0
Accelerated Payments of Dealer Holdback |  | 0.0 | 0.0 | 0.0 | 0.0
Payments of Dealer Holdback |  | 0.0 | 0.0 | 0.0 | 0.0
Loans And Leases Receivable Transfers | [3] | (10.9) | (12.3) | (22.9) | (19.0)
Allowance for Loan and Lease Losses, Write-offs |  | (157.8) | (183.6) | (326.4) | (366.5)
Recoveries | [4] | (1.1) | (1.2) | (1.9) | (2.0)
Deferral of Loan Origination Costs |  | 0.0 | 0.0 | 0.0 | 0.0
Balance, end of period |  | $ (677.0) | $ (800.9) | $ (677.0) | $ (800.9)
[1] | The Dealer Loans amount represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program. The Purchased Loans amount represents one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program.
[2] | Represents repayments that we collected on Consumer Loans assigned under our programs.
[3] | Under our Portfolio Program, certain events may result in Dealers forfeiting their rights to Dealer Holdback. We transfer the Dealer’s outstanding Dealer Loan balance and related allowance for credit losses balance to Purchased Loans in the period this forfeiture occurs.
[4] | The Dealer Loans amount represents net cash flows received (collections less any related Dealer Holdback payments) on Dealer Loans that were previously written off in full. The Purchased Loans amount represents collections received on Purchased Loans that were previously written off in full.

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- Definition The cash outflow for payments made to dealers under our Portfolio Program at the time a pool of 100 or more consumer loans is closed by dealers with a single open pool or at the time 100 consumer loans have been collectively assigned by dealers with multiple open pools. + References No definition available. + Details
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- Definition The cash outflow for payments made to dealers under our Portfolio Program from the portion of the collections on the underlying consumer loans that exceed amounts retained by us to recover the advance balance, certain collection costs, and our servicing fee. + References No definition available. + Details
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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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- Definition The cash inflow associated with the collection, including prepayments, of loans receivable issued for financing of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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