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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Gross cost at January 1			$ 295.8	$ 248.6
Acquisitions			0.0	33.5
Internally developed software			0.8	0.0
Exchange effect			(1.4)	(0.1)
Gross cost at June 30	$ 295.2	$ 282.0	295.2	282.0
Accumulated amortization at January 1			(132.5)	(104.2)
Amortization expense	(6.9)	(6.8)	(13.6)	(13.7)
Exchange effect			0.3	0.0
Accumulated amortization at June 30	(145.8)	(117.9)	(145.8)	(117.9)
Net book amount at June 30	$ 149.4	$ 164.1	$ 149.4	$ 164.1	$ 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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Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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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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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