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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Gross cost at January 1			$ 294.6	$ 295.8
Internally developed software			0.7	0.8
Exchange effect			(0.3)	(1.4)
Gross cost at June 30	$ 295.0	$ 295.2	295.0	295.2
Accumulated amortization at January 1			(158.3)	(132.5)
Amortization expense	(5.8)	(6.9)	(11.5)	(13.6)
Exchange effect			(0.1)	0.3
Accumulated amortization at June 30	(169.9)	(145.8)	(169.9)	(145.8)
Net book amount at June 30	$ 125.1	$ 149.4	$ 125.1	$ 149.4	$ 136.3

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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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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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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