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Schedule 1 - Valuation and Qualifying Accounts (Detail) - Valuation allowances on deferred tax assets - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation allowance, Balance at beginning of year $ 435.5 $ 330.2 $ 324.4
Valuation allowance reversed 0.0 0.0 0.0
Valuation allowance raised 112.6 38.3 1.1
Arising on acquisition/ disposal of subsidiaries     (5.4)
Charged to unredeemed capital expenditure 58.3 108.1 60.2
Foreign currency translation adjustment (100.7) (41.1) (50.1)
Valuation allowance, Balance at end of year $ 505.7 $ 435.5 $ 330.2