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Loans Receivable Loans Receivable (Summary of Provision for Credit Losses) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Provision for credit losses | $ 137.4 | $ 23.3
Dealer Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Provision for credit losses | 74.7 | 1.5
Purchased Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Provision for credit losses | 62.7 | 21.8
New Consumer Loan Assignments [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Provision for credit losses | 93.1 | 102.6
New Consumer Loan Assignments [Member] | Dealer Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Provision for credit losses | 37.7 | 47.5
New Consumer Loan Assignments [Member] | Purchased Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Provision for credit losses | 55.4 | 55.1
Forecast Changes [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Provision for credit losses | 44.3 | (79.3)
Forecast Changes [Member] | Dealer Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Provision for credit losses | 37.0 | (46.0)
Forecast Changes [Member] | Purchased Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Provision for credit losses | $ 7.3 | $ (33.3)

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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(2) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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