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Goodwill and Identifiable Intangible Assets - Gross Carrying Value and Accumulated Amortization by Class of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Intangible Assets [Line Items]    
Gross Carrying Amounts, Total identifiable intangibles $ 1,441.0 $ 1,449.6
Gross Carrying Amounts, Finite Lived 734.8 739.7
Accumulated Amortization, Finite Lived (302.0) (287.2)
Net Book Value, Total identifiable intangibles 1,139.0 1,162.4
Net Book Value, Finite Lived 432.8 452.5
Gross Carrying Amounts, Indefinite-lived tradenames 706.2 709.9
Net Book Value, Indefinite-lived tradenames 706.2 709.9
Tradenames [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 15.5 15.7
Accumulated Amortization, Finite Lived (10.8) (9.9)
Net Book Value, Finite Lived 4.7 5.8
Customer and contractual relationships [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 658.9 663.8
Accumulated Amortization, Finite Lived (244.7) (232.0)
Net Book Value, Finite Lived 414.2 431.8
Patents/proprietary technology [Member]    
Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite Lived 60.4 60.2
Accumulated Amortization, Finite Lived (46.5) (45.3)
Net Book Value, Finite Lived $ 13.9 $ 14.9