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Summary of Significant Accounting Policies, Accounts Receivable (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Warehouse Receivables and Facilities [Abstract] |  |  |
Unbilled Contracts Receivable | $ 625.3 | $ 593.8 |
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset | 2.6 | 4.2 | $ 17.6
Bank Servicing Fees. | 160.0 | 152.6 | 157.1
Placement Fees | 90.9 | 79.6 | 19.8
Payment for Origination, Loan, Mortgage, Held-for-Sale | (10,301.5) | (7,877.6) |
Proceeds from Sale and Collection, Loan, Held-for-Sale | 10,127.5 | 7,668.6 |
Net increase in Warehouse facilities | 178.3 | 207.4 |
Unpaid principal balance of loans in MSR Portfolio | 140,100.0 | 135,900.0 |
Allowance For Doubtful Accounts, Current. [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Allowance at beginning of the year | 70.7 | 66.7 | 67.6
Charged to income | 28.2 | 22.0 | 25.0
Write-off of uncollectible receivables | (36.6) | (15.8) | (23.2)
Impact of exchange rate movements and other | (1.5) | (2.2) | (2.7)
Allowance at end of the year | $ 60.8 | $ 70.7 | $ 66.7

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