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Goodwill - Summarizes Goodwill Movement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
At January 1, Gross cost			$ 384.2	$ 375.5
At January 1, Accumulated impairment losses			(235.2)	(234.0)
At January 1, Net book amount			149.0	141.5
Exchange effect			(0.1)	(0.1)
Adjustments to purchase price allocation			0.4	0
Impairment losses	(0.3)	(0.3)	(0.6)	(0.6)
At June 30, Gross cost	384.5	375.4	384.5	375.4
At June 30, Accumulated impairment losses	(235.8)	(234.6)	(235.8)	(234.6)
At June 30, Net book amount	$ 148.7	$ 140.8	$ 148.7	$ 140.8

X

- 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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