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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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Gross cost at January 1			$ 106.2	$ 51.2
Capitalization of internally developed software and other costs			9.0	6.4
Acquisitions			33.7	0
Exchange effect			0.1	0.2
Gross cost at September 30	149.0	57.8	149.0	57.8
Accumulated amortization at January 1			(37.6)	(33.5)
Amortization expense	(2.4)	(1.1)	(6.6)	(3.1)
Exchange effect			0	(0.2)
Accumulated amortization at September 30	(44.2)	(36.8)	(44.2)	(36.8)
Net book amount at September 30	$ 104.8	$ 21.0	$ 104.8	$ 21.0	$ 68.6

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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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