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Goodwill (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 1,075.4 $ 1,295.2
Translation adjustment (55.3) (219.8)
Goodwill, Ending Balance $ 1,020.1 $ 1,075.4