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Property
12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment, Net [Abstract]  
Property PROPERTY
A summary of the property accounts at December 31, 2023 and 2022 is presented below:
(in millions)20232022Estimated Useful Life
Building and building improvements$130.7 $132.2 1 - 10 years
Leasehold improvements143.7 224.8 3 - 19 years
Furniture, fixtures and equipment413.3 551.3 2 - 7 years
Software and software development costs654.9 692.4 2 - 4 years
Total property1,342.6 1,600.7 
Less accumulated depreciation and amortization(933.1)(1,145.2)
Property, net$409.5 $455.5