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Summary of Significant Accounting Policies, Accounts Receivable (Details) - USD ($)
$ in Millions
 12 Months Ended
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