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Fixed Assets - Summary of Fixed Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property Plant and Equipment Useful Life and Values [Abstract]    
Office equipment $ 30.0 $ 28.6
Furniture and fixtures 116.9 112.3
Leasehold improvements 132.1 124.2
Computer equipment 145.1 147.9
Land and buildings - corporate headquarters 144.3 143.6
Software 346.0 291.9
Other 12.4 12.0
Work in process 14.9 20.1
Gross fixed assets 941.7 880.6
Accumulated depreciation (504.8) (468.4)
Net fixed assets $ 436.9 $ 412.2 [1]
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.