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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 9 Months Ended 0 Months Ended
Jul. 22, 2014
Apr. 22, 2014
Sep. 03, 2014
Jun. 03, 2014
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Nov. 04, 2014
Subsequent Event [Member]
Oct. 21, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]                      
Payments for Repurchase of Common Stock         $ 3.4 $ 3.3   $ 6.7 $ 0    
Payments of Ordinary Dividends, Common Stock     1.9 1.9       3.8 0    
Cash dividends declared per common share $ 0.03 $ 0.03     $ 0.03   $ 0.00 $ 0.06 $ 0.00   $ 0.03
Stock Repurchase Program, Authorized Amount   15.0               75.0  
Actuarial losses         1.4   2.2 4.1 6.3    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax         $ 0.1   $ (0.2) [1] $ (0.1) [2] $ 0.1 [1]    
[1] The change in actuarial losses in the three and nine months ended September 30, 2013 represents $2.2 million and $6.3 million, respectively, of actuarial losses that have been included in the computation of net postretirement pension expense and $0.7 million and $0.6 million, respectively, of income tax expense largely due to a change in the United Kingdom tax rate that was enacted during the prior year third quarter.
[2] The change in actuarial losses in the three and nine months ended September 30, 2014 includes $1.4 million and $4.1 million, respectively, of actuarial losses that have been included in the computation of net postretirement pension expense for the period