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Change in Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Class of Stock [Line Items]      
Actuarial (gain) loss $ 8.4    
Tax expense on change in unrecognized losses related to pension benefit plan (15.8) (0.3) (1.6)
Income Tax Expense (Benefit) [Member]
      
Class of Stock [Line Items]      
Tax expense on change in unrecognized losses related to pension benefit plan $ 0.6