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Fixed Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fixed assets    
Fixed assets, at cost $ 251.1 $ 250.7
Accumulated depreciation and amortization (158.8) (146.4)
Fixed assets (net) 92.3 104.3
Building and leasehold improvements    
Fixed assets    
Fixed assets, at cost 116.3 117.8
Software    
Fixed assets    
Fixed assets, at cost 52.6 51.0
Equipment    
Fixed assets    
Fixed assets, at cost 43.0 42.3
Furniture and fixtures    
Fixed assets    
Fixed assets, at cost 21.3 21.0
Land, improvements and other    
Fixed assets    
Fixed assets, at cost $ 17.9 $ 18.6