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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Gross cost at January 1			$ 295.8	$ 248.6
Acquisitions			0.0	37.7
Internally developed software			0.8	4.1
Exchange effect			(1.6)	4.1
Gross cost at September 30	$ 295.0	$ 294.5	295.0	294.5
Accumulated amortization at January 1			(132.5)	(104.2)
Amortization expense	(6.8)	(6.9)	(20.4)	(20.6)
Exchange effect			0.2	(0.1)
Accumulated amortization at September 30	(152.7)	(124.9)	(152.7)	(124.9)
Net book amount at September 30	$ 142.3	$ 169.6	$ 142.3	$ 169.6	$ 163.3

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Amount of increase (decrease) to amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments.

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Additions made to capitalized computer software costs during the period.

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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.

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