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Accumulated Other Comprehensive Loss - Changes in Each Component of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Equity [Abstract]    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax   $ 2.0
Tax expense on change in unrecognized losses related to pension benefit plans   0.1
Actuarial losses 1.3  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax $ (0.1) $ 0.3 [1]
[1] The change in actuarial losses in the three months ended March 31, 2014 includes $1.3 million of actuarial losses that have been included in the computation of net postretirement pension expense for the period.