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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Gross cost at January 1			$ 248.6	$ 248.6
Acquisitions			37.7	0.0
Internally developed software			4.1	0.0
Exchange effect			4.1	0.0
Gross cost at September 30	$ 294.5	$ 248.6	294.5	248.6
Accumulated amortization at January 1			(104.2)	(79.9)
Amortization expense	(6.9)	(6.1)	(20.6)	(18.2)
Exchange effect			(0.1)	0.0
Accumulated amortization at September 30	(124.9)	(98.1)	(124.9)	(98.1)
Net book amount at September 30	$ 169.6	$ 150.5	$ 169.6	$ 150.5	$ 144.4

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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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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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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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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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