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Property (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Property, gross $ 1,600.7 $ 1,544.8
Less accumulated depreciation and amortization (1,145.2) (1,039.5)
Property, net 455.5 505.3
Software and software development costs    
Property, Plant and Equipment [Line Items]    
Property, gross 692.4 661.1
Furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Property, gross 551.3 519.1
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, gross 224.8 232.3
Building and building improvements    
Property, Plant and Equipment [Line Items]    
Property, gross $ 132.2 $ 132.3
Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum 2 years  
Minimum [Member] | Software and software development costs    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum 2 years  
Minimum [Member] | Furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum 2 years  
Minimum [Member] | Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum 3 years  
Minimum [Member] | Building and building improvements    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum 1 year  
Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum 20 years  
Maximum [Member] | Software and software development costs    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum 4 years  
Maximum [Member] | Furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum 7 years  
Maximum [Member] | Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum 19 years  
Maximum [Member] | Building and building improvements    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum 10 years