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Property and Equipment (Schedule of Property and Equipment) (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Abstract]    
Land $ 26.5 $ 26.6
Buildings 195.8 193.4
Leasehold improvements 66.5 71.3
Furniture and equipment 175.7 184.8
Capitalized software 1,283.2 1,268.8
Property and equipment, Gross 1,747.7 1,744.9
Accumulated depreciation and amortization (1,002.6) (995.3)
Property and equipment, Total $ 745.1 $ 749.6