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Shareholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Apr. 22, 2014
Jun. 03, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jul. 22, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]              
Payments of Ordinary Dividends, Common Stock   $ 1.9     $ 1.9 $ 0  
Common Stock, Dividends, Per Share, Declared $ 0.03           $ 0.03
Stock Repurchase Program, Authorized Amount 15.0            
Actuarial losses     1.4 2.1 2.7 4.1  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax     $ (0.1) $ 0 [1] $ (0.2) [2] $ 0.3 [1]  
[1] The change in actuarial losses in the three and six months ended June 30, 2013 represents $2.1 million and $4.1 million of actuarial losses that have been included in computation of net postretirement pension expense.
[2] The change in actuarial losses in the three and six months ended June 30, 2014 includes $1.4 million and $2.7 million of actuarial losses that have been included in the computation of net postretirement pension expense for the period.