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Fixed Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fixed assets    
Fixed assets, at cost $ 255.1 $ 251.1
Accumulated depreciation and amortization (175.5) (158.8)
Fixed assets (net) 79.6 92.3
Buildings and leasehold improvements    
Fixed assets    
Fixed assets, at cost 116.5 116.3
Software    
Fixed assets    
Fixed assets, at cost 55.3 52.6
Equipment    
Fixed assets    
Fixed assets, at cost 44.3 43.0
Furniture and fixtures    
Fixed assets    
Fixed assets, at cost 21.0 21.3
Land, improvements and other    
Fixed assets    
Fixed assets, at cost $ 18.0 $ 17.9