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Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Balance	$ 1,961.0	$ 1,933.1
Translation	(11.2)	27.9
Balance	1,949.8	1,961.0	$ 1,933.1
HCM [Member]
Goodwill [Line Items]
Balance	$ 1,961.0	1,933.1	2,008.5
Formation of Joint Venture Company			(87.7)
Translation		27.9	12.3
Balance		1,961.0	$ 1,933.1
Tax-deductible goodwill		$ 12.2

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Topic 350
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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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