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Depreciation and Interest Charges on Property, Plant and Equipment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Property, Plant and Equipment [Line Items]        
Depreciation and amortization on PP&E $ 14.7 $ 15.0 $ 29.4 $ 30.8
Interest charges capitalized (in construction in progress) $ 0.1 $ 0.1 $ 0.3 $ 0.2