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Goodwill - Summary of Goodwill (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
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 |  |  | (0.3) | (0.1)
Acquisitions |  |  | 0 | 17.0
Adjustments to purchase price allocation |  |  | 0.3 | 0.4
Impairment losses | 0 | (0.4) | 0 | (1.0)
At September 30, Gross cost | 424.4 | 401.5 | 424.4 | 401.5
At September 30, Accumulated impairment losses | (236.5) | (236.2) | (236.5) | (236.2)
At September 30, Net book amount | $ 187.9 | $ 165.3 | $ 187.9 | $ 165.3

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