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Goodwill - Summary of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
At January 1, Gross cost			$ 424.4	$ 384.2
At January 1, Accumulated impairment losses			(236.5)	(235.2)
At January 1, Net book amount			187.9	149.0
Exchange effect			(0.1)	(0.1)
Adjustments to purchase price allocation			0.3	0.4
Impairment losses	0	(0.3)	0	(0.6)
At June 30, Gross cost	424.6	384.5	424.6	384.5
At June 30, Accumulated impairment losses	(236.5)	(235.8)	(236.5)	(235.8)
At June 30, Net book amount	$ 188.1	$ 148.7	$ 188.1	$ 148.7

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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