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Other Intangible Assets - Summary of Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 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			6.1	9.0
Acquisitions			0	33.7
Exchange effect			0	0.1
Gross cost at September 30	181.6	149.0	181.6	149.0
Accumulated amortization at January 1			(48.7)	(37.6)
Amortization expense	(3.9)	(2.4)	(12.7)	(6.6)
Exchange effect			0	0
Accumulated amortization at September 30	(61.4)	(44.2)	(61.4)	(44.2)
Net book amount at September 30	$ 120.2	$ 104.8	$ 120.2	$ 104.8	$ 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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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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