Goodwill and Identifiable Intangible Assets - Gross Carrying Value and Accumulated Amortization by Class of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Intangible Assets [Line Items]
Gross Carrying Amounts, Total identifiable intangibles	$ 1,646.0	$ 1,449.6
Gross Carrying Amounts, Finite Lived	922.0	739.7
Accumulated Amortization, Finite Lived	(312.2)	(287.2)
Net Book Value, Total identifiable intangibles	1,333.8	1,162.4
Net Book Value, Finite Lived	609.8	452.5
Gross Carrying Amounts, Indefinite-lived tradenames	724.0	709.9
Accumulated Amortization, Indefinite-lived tradenames	0.0	0.0
Net Book Value, Indefinite-lived tradenames	724.0	709.9
Tradenames [Member]
Intangible Assets [Line Items]
Gross Carrying Amounts, Finite Lived	15.7	15.7
Accumulated Amortization, Finite Lived	(11.6)	(9.9)
Net Book Value, Finite Lived	4.1	5.8
Customer and contractual relationships [Member]
Intangible Assets [Line Items]
Gross Carrying Amounts, Finite Lived	832.7	663.8
Accumulated Amortization, Finite Lived	(253.4)	(232.0)
Net Book Value, Finite Lived	579.3	431.8
Patents/proprietary technology [Member]
Intangible Assets [Line Items]
Gross Carrying Amounts, Finite Lived	73.6	60.2
Accumulated Amortization, Finite Lived	(47.2)	(45.3)
Net Book Value, Finite Lived	$ 26.4	$ 14.9

Indefinite Lived Intangible Assets Accumulated Amortization

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Intangible Assets [Line Items]

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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