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Goodwill - Summary of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 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	(0.1)
Impairment losses	0	(0.3)
At March 31, Gross cost	424.4	384.1
At March 31, Accumulated impairment losses	(236.5)	(235.5)
At March 31, Net book amount	$ 187.9	$ 148.6

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.

+ References

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-Publisher FASB

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Amount before 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.

+ References

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