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Other Intangible Assets - Summary of Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Gross cost at January 1	$ 175.5	$ 106.2
Capitalization of internally developed software and other costs	1.5	2.1
Exchange effect	0	0
Gross cost at March 31	177.0	108.3
Accumulated amortization at January 1	(48.7)	(37.6)
Amortization expense	(4.4)	(2.1)
Exchange effect	0.1	(0.1)
Accumulated amortization at March 31	(53.0)	(39.8)
Net book amount at March 31	$ 124.0	$ 68.5	$ 126.8

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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 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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