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Loans Receivable Loans Receivable (Summary of Past-Due Status) (Details) - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Loans receivable    
Loans receivable [1],[2] $ 11,197,600,000 $ 10,020,100,000
Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3],[4] 7,736,400,000 6,507,100,000
Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 1,746,900,000 1,694,500,000
Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 1,449,100,000 1,568,800,000
Post-term [Member]    
Loans receivable    
Loans receivable [1],[2],[5] 265,200,000 249,700,000
Dealer Loans [Member]    
Loans receivable    
Loans receivable [1] 8,348,700,000 7,065,500,000
Dealer Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 5,907,300,000 [4] 4,742,300,000
Dealer Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 1,311,600,000 1,181,300,000
Dealer Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 977,300,000 998,000,000.0
Dealer Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [1],[5] 152,500,000 143,900,000
Purchased Loans [Member]    
Loans receivable    
Loans receivable [2] 2,848,900,000 2,954,600,000
Purchased Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3],[4] 1,829,100,000 1,764,800,000
Purchased Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 435,300,000 513,200,000
Purchased Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 471,800,000 570,800,000
Purchased Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [2],[5] 112,700,000 105,800,000
Loans Originating Five Years Prior And Before    
Loans receivable    
Loans receivable [1],[2] 453,500,000 319,400,000
Loans Originating Five Years Prior And Before | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3],[4] 47,500,000 24,200,000
Loans Originating Five Years Prior And Before | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 30,900,000 16,800,000
Loans Originating Five Years Prior And Before | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 133,700,000 73,500,000
Loans Originating Five Years Prior And Before | Post-term [Member]    
Loans receivable    
Loans receivable [1],[2],[5] 241,400,000 204,900,000
Loans Originating Five Years Prior And Before | Dealer Loans [Member]    
Loans receivable    
Loans receivable [1] 231,500,000 172,400,000
Loans Originating Five Years Prior And Before | Dealer Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 21,200,000 [4] 11,700,000
Loans Originating Five Years Prior And Before | Dealer Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 13,500,000 7,900,000
Loans Originating Five Years Prior And Before | Dealer Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 61,800,000 35,000,000.0
Loans Originating Five Years Prior And Before | Dealer Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [1],[5] 135,000,000.0 117,800,000
Loans Originating Five Years Prior And Before | Purchased Loans [Member]    
Loans receivable    
Loans receivable [2] 222,000,000.0 147,000,000.0
Loans Originating Five Years Prior And Before | Purchased Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3],[4] 26,300,000 12,500,000
Loans Originating Five Years Prior And Before | Purchased Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 17,400,000 8,900,000
Loans Originating Five Years Prior And Before | Purchased Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 71,900,000 38,500,000
Loans Originating Five Years Prior And Before | Purchased Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [2],[5] 106,400,000 87,100,000
Loans Originating Four Years Prior    
Loans receivable    
Loans receivable [1],[2] 466,600,000 511,600,000
Loans Originating Four Years Prior | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3],[4] 156,200,000 150,700,000
Loans Originating Four Years Prior | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 81,800,000 83,800,000
Loans Originating Four Years Prior | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 207,900,000 237,600,000
Loans Originating Four Years Prior | Post-term [Member]    
Loans receivable    
Loans receivable [1],[2],[5] 20,700,000 39,500,000
Loans Originating Four Years Prior | Dealer Loans [Member]    
Loans receivable    
Loans receivable [1] 281,000,000.0 241,100,000
Loans Originating Four Years Prior | Dealer Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 93,500,000 [4] 69,900,000
Loans Originating Four Years Prior | Dealer Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 48,400,000 38,000,000.0
Loans Originating Four Years Prior | Dealer Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 124,100,000 111,200,000
Loans Originating Four Years Prior | Dealer Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [1],[5] 15,000,000.0 22,000,000.0
Loans Originating Four Years Prior | Purchased Loans [Member]    
Loans receivable    
Loans receivable [2] 185,600,000 270,500,000
Loans Originating Four Years Prior | Purchased Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3],[4] 62,700,000 80,800,000
Loans Originating Four Years Prior | Purchased Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 33,400,000 45,800,000
Loans Originating Four Years Prior | Purchased Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 83,800,000 126,400,000
Loans Originating Four Years Prior | Purchased Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [2],[5] 5,700,000 17,500,000
Loans Originating Three Years Prior    
Loans receivable    
Loans receivable [1],[2] 768,600,000 813,500,000
Loans Originating Three Years Prior | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3],[4] 339,900,000 328,900,000
Loans Originating Three Years Prior | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 145,200,000 165,500,000
Loans Originating Three Years Prior | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 280,900,000 314,500,000
Loans Originating Three Years Prior | Post-term [Member]    
Loans receivable    
Loans receivable [1],[2],[5] 2,600,000 4,600,000
Loans Originating Three Years Prior | Dealer Loans [Member]    
Loans receivable    
Loans receivable [1] 511,800,000 493,600,000
Loans Originating Three Years Prior | Dealer Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 229,400,000 [4] 201,700,000
Loans Originating Three Years Prior | Dealer Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 95,000,000.0 98,000,000.0
Loans Originating Three Years Prior | Dealer Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 185,300,000 190,400,000
Loans Originating Three Years Prior | Dealer Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [1],[5] 2,100,000 3,500,000
Loans Originating Three Years Prior | Purchased Loans [Member]    
Loans receivable    
Loans receivable [2] 256,800,000 319,900,000
Loans Originating Three Years Prior | Purchased Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3],[4] 110,500,000 127,200,000
Loans Originating Three Years Prior | Purchased Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 50,200,000 67,500,000
Loans Originating Three Years Prior | Purchased Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 95,600,000 124,100,000
Loans Originating Three Years Prior | Purchased Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [2],[5] 500,000 1,100,000
Loans Originating Two Years Prior    
Loans receivable    
Loans receivable [1],[2] 1,640,300,000 1,228,100,000
Loans Originating Two Years Prior | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3],[4] 948,800,000 596,600,000
Loans Originating Two Years Prior | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 304,800,000 262,100,000
Loans Originating Two Years Prior | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 386,200,000 368,700,000
Loans Originating Two Years Prior | Post-term [Member]    
Loans receivable    
Loans receivable [1],[2],[5] 500,000 700,000
Loans Originating Two Years Prior | Dealer Loans [Member]    
Loans receivable    
Loans receivable [1] 1,169,500,000 826,300,000
Loans Originating Two Years Prior | Dealer Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 681,000,000.0 [4] 407,300,000
Loans Originating Two Years Prior | Dealer Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 215,000,000.0 173,400,000
Loans Originating Two Years Prior | Dealer Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 273,100,000 245,000,000.0
Loans Originating Two Years Prior | Dealer Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [1],[5] 400,000 600,000
Loans Originating Two Years Prior | Purchased Loans [Member]    
Loans receivable    
Loans receivable [2] 470,800,000 401,800,000
Loans Originating Two Years Prior | Purchased Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3],[4] 267,800,000 189,300,000
Loans Originating Two Years Prior | Purchased Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 89,800,000 88,700,000
Loans Originating Two Years Prior | Purchased Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 113,100,000 123,700,000
Loans Originating Two Years Prior | Purchased Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [2],[5] 100,000 100,000
Loans Originating In The Prior Year    
Loans receivable    
Loans receivable [1],[2] 3,352,500,000 2,440,300,000
Loans Originating In The Prior Year | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3],[4] 2,375,700,000 1,518,000,000
Loans Originating In The Prior Year | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 608,600,000 499,800,000
Loans Originating In The Prior Year | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 368,200,000 422,500,000
Loans Originating In The Prior Year | Post-term [Member]    
Loans receivable    
Loans receivable [1],[2],[5] 0 0
Loans Originating In The Prior Year | Dealer Loans [Member]    
Loans receivable    
Loans receivable [1] 2,481,200,000 1,773,300,000
Loans Originating In The Prior Year | Dealer Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 1,749,800,000 [4] 1,109,400,000
Loans Originating In The Prior Year | Dealer Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 458,800,000 360,400,000
Loans Originating In The Prior Year | Dealer Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 272,600,000 303,500,000
Loans Originating In The Prior Year | Dealer Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [1],[5] 0 0
Loans Originating In The Prior Year | Purchased Loans [Member]    
Loans receivable    
Loans receivable [2] 871,300,000 667,000,000.0
Loans Originating In The Prior Year | Purchased Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3],[4] 625,900,000 408,600,000
Loans Originating In The Prior Year | Purchased Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 149,800,000 139,400,000
Loans Originating In The Prior Year | Purchased Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 95,600,000 119,000,000.0
Loans Originating In The Prior Year | Purchased Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [2],[5] 0 0
Loans Originating In The Current Year    
Loans receivable    
Loans receivable [1],[2] 4,516,100,000 4,707,200,000
Loans Originating In The Current Year | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3],[4] 3,868,300,000 3,888,700,000
Loans Originating In The Current Year | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 575,600,000 666,500,000
Loans Originating In The Current Year | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[2],[3] 72,200,000 152,000,000.0
Loans Originating In The Current Year | Post-term [Member]    
Loans receivable    
Loans receivable [1],[2],[5] 0 0
Loans Originating In The Current Year | Dealer Loans [Member]    
Loans receivable    
Loans receivable [1] 3,673,700,000 3,558,800,000
Loans Originating In The Current Year | Dealer Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 3,132,400,000 [4] 2,942,300,000
Loans Originating In The Current Year | Dealer Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 480,900,000 503,600,000
Loans Originating In The Current Year | Dealer Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [1],[3] 60,400,000 112,900,000
Loans Originating In The Current Year | Dealer Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [1],[5] 0 0
Loans Originating In The Current Year | Purchased Loans [Member]    
Loans receivable    
Loans receivable [2] 842,400,000 1,148,400,000
Loans Originating In The Current Year | Purchased Loans [Member] | Current, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3],[4] 735,900,000 946,400,000
Loans Originating In The Current Year | Purchased Loans [Member] | Past Due 11-90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 94,700,000 162,900,000
Loans Originating In The Current Year | Purchased Loans [Member] | Past Due Over 90 Days, Pre-term [Member]    
Loans receivable    
Loans receivable [2],[3] 11,800,000 39,100,000
Loans Originating In The Current Year | Purchased Loans [Member] | Post-term [Member]    
Loans receivable    
Loans receivable [2],[5] $ 0 $ 0
[1] As Consumer Loans are aggregated by Dealer for purposes of recognizing revenue and measuring credit losses, the Dealer Loan amount was estimated by allocating the balance of each Dealer Loan to the underlying Consumer Loans based on the forecasted future collections of each Consumer Loan.
[2] As certain Consumer Loans are aggregated by Dealer or month of purchase for purposes of recognizing revenue and measuring credit losses, the Purchased Loan amount was estimated by allocating the balance of certain Purchased Loans to the underlying Consumer Loans based on the forecasted future collections of each Consumer Loan.
[3] Represents the Loan balance attributable to Consumer Loans outstanding within their initial loan terms.
[4] We consider a Consumer Loan to be current for purposes of forecasting expected collection rates if contractual repayments are less than 11 days past due.
[5] Represents the Loan balance attributable to Consumer Loans outstanding beyond their initial loan terms.