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Loans Receivable (Summary Of Information Related To New Consumer Loan Assignments) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Contractual net cash flows at the time of assignment |  | $ 6,658.1 | $ 6,763.9 | $ 6,438.1
New Consumer Loan Assignments |  | 5,131.6 | 5,305.0 | 5,074.4
Fair value at the time of assignment |  | 3,641.2 | 3,772.2 | 3,595.8
Provision for credit losses |  | (556.9) | (76.4) | (56.9)
Expected future finance charges at the time of assignment | [1] | 2,009.0 | 1,532.8 | 1,478.6
Expected net Loan income at the time of assignment | [2] | 1,490.4 | 1,532.8 | 1,478.6
Dealer Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Contractual net cash flows at the time of assignment |  | 3,506.9 | 3,810.6 | 3,827.4
New Consumer Loan Assignments |  | 3,113.4 | 3,396.1 | 3,405.0
Fair value at the time of assignment |  | 2,207.8 | 2,424.5 | 2,414.8
Provision for credit losses |  | (239.7) | (65.9) | (48.0)
Expected future finance charges at the time of assignment | [1] | 1,115.3 | 971.6 | 990.2
Expected net Loan income at the time of assignment | [2] | 905.6 | 971.6 | 990.2
Purchased Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Contractual net cash flows at the time of assignment |  | 3,151.2 | 2,953.3 | 2,610.7
New Consumer Loan Assignments |  | 2,018.2 | 1,908.9 | 1,669.4
Fair value at the time of assignment |  | 1,433.4 | 1,347.7 | 1,181.0
Provision for credit losses |  | (317.2) | (10.5) | (8.9)
Expected future finance charges at the time of assignment | [1] | 893.7 | 561.2 | 488.4
Expected net Loan income at the time of assignment | [2] | 584.8 | 561.2 | 488.4
New Consumer Loan assignments |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses |  | (518.6) | 0.0 | 0.0
New Consumer Loan assignments | Dealer Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses |  | (209.7) | 0.0 | 0.0
New Consumer Loan assignments | Purchased Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses |  | $ (308.9) | $ 0.0 | $ 0.0
[1] | Represents revenue that is expected to be recognized on a level-yield basis over the lives of the Loans.
[2] | Represents the amount that expected net cash flows at the time of assignment (2) exceed Loans receivable at the time of assignment (3).

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