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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Gross cost at January 1			$ 294.6	$ 295.8
Internally developed software			1.1	0.8
Exchange effect			(2.1)	(1.6)
Gross cost at September 30	$ 293.6	$ 295.0	293.6	295.0
Accumulated amortization at January 1			(158.3)	(132.5)
Amortization expense	(5.7)	(6.8)	(17.2)	(20.4)
Exchange effect			0.3	0.2
Accumulated amortization at September 30	(175.2)	(152.7)	(175.2)	(152.7)
Net book amount at September 30	$ 118.4	$ 142.3	$ 118.4	$ 142.3	$ 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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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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