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Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount, total other intangible assets $ 586.6 $ 599.1
Accumulated Amortization, total other intangible assets (466.4) (455.8)
Net Book Value, total other intangible assets 120.2 143.3
Client Relationships    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount, total other intangible assets 524.2 534.1
Accumulated Amortization, total other intangible assets (423.2) (412.4)
Net Book Value, total other intangible assets 101.0 121.7
Patents    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount, total other intangible assets 2.0 2.0
Accumulated Amortization, total other intangible assets (2.0) (2.0)
Trademarks, Licenses and Agreements    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount, total other intangible assets 25.7 26.2
Accumulated Amortization, total other intangible assets (25.1) (25.2)
Net Book Value, total other intangible assets 0.6 1.0
Trade Names    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount, total other intangible assets 34.7 36.8
Accumulated Amortization, total other intangible assets (16.1) (16.2)
Net Book Value, total other intangible assets $ 18.6 $ 20.6