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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Gross cost at January 1			$ 248.6	$ 247.6
Capitalization of internally developed software			0.0	5.1
Gross cost at June 30	$ 248.6	$ 252.7	248.6	252.7
Accumulated amortization at January 1			(79.9)	(66.5)
Amortization expense	(6.1)	(5.3)	(12.1)	(10.4)
Exchange effect			0.0	0.1
Accumulated amortization at June 30	(92.0)	(76.8)	(92.0)	(76.8)
Net book amount at June 30	$ 156.6	$ 175.9	$ 156.6	$ 175.9	$ 168.7

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
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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 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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