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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]  
Mortgage Loans
Year Ended December 31,
(in millions)20242023
Origination of mortgage loans$(10,301.5)(7,877.6)
Proceeds from the sales of mortgage loans10,127.5 7,668.6 
Net increase in Warehouse facilities178.3 207.4 
Disaggregation of Revenue
Year Ended December 31,
(in millions)202420232022
Revenue excluded from scope of ASC Topic 606$325.9 286.3 293.6 
Contract with Customer, Contract Asset, Contract Liability, and Receivable
Such contract assets and liabilities are presented below.
(in millions)December 31, 2024December 31, 2023
Contract assets, gross$388.3 402.3 
Contract asset allowance(3.9)(1.8)
Contract assets, net$384.4 400.5 
Contract liabilities$154.7 166.2 
Financing Receivable, Allowance for Credit Loss [Table Text Block]
The following table details the changes in the allowance for uncollectible receivables.
(in millions)202420232022
Allowance as of January 1,$70.7 66.7 67.6 
Charged to income28.2 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 as of December 31,$60.8 70.7 66.7 
Property, Plant and Equipment [Table Text Block] The following table shows the gross value of major asset categories and the standard depreciable lives, as of December 31, 2024, for each of these asset categories.
December 31,
($ in millions)20242023Depreciable Life
Furniture, fixtures and equipment$144.9 145.4 3 to 13 years
Computer equipment and software1,070.7 987.9 2 to 7 years
Leasehold improvements480.6 468.2 1 to 15 years
Other(1)
63.5 51.5 2 to 30 years
Total1,759.7 1,653.0 
Less: Accumulated depreciation1,161.6 1,039.1 
Net property and equipment$598.1 613.9 
(1) Other includes certain assets, such as land, which are not depreciated.