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Shareholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Jul. 22, 2014
Apr. 22, 2014
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2013
Nov. 04, 2014
Subsequent Event [Member]
Oct. 21, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]                    
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  
Treasury Stock, Shares, Acquired     230,150 232,475            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Beginning balance, Pension Benefit Plan Costs       (56.7)   (58.1) (91.0) (85.6)    
Other comprehensive income (expense) before reclassifications, Pension Benefit Plan Costs     0.6   (4.1) 0.3 (2.7)      
Amounts reclassified from accumulated other comprehensive income, Pension Benefit Plan Costs     0.8   2.9 [1] 2.5 [2] 6.9 [1]      
Net current-period other comprehensive income (expense, Pension Benefit Plan Costs     1.4   (1.2) 2.8 4.2      
Ending balance, Pension Benefit Plan Costs     (55.3)   (86.8) (55.3) (86.8) (85.6)    
Beginning balance, Foreign Currency       16.4   16.0 10.8 6.3    
Other comprehensive income (expense) before reclassifications, Foreign Currency     (9.6)   6.3 (9.4) 2.1      
Amounts reclassified from accumulated other comprehensive income, Foreign Currency     (0.1)   0.2 [1] 0.1 [2] (0.1) [1]      
Net current-period other comprehensive income (expense, Foreign Currency     (9.7)   6.5 (9.3) 2.0      
Ending balance, Foreign Currency     6.7   12.8 6.7 12.8 6.3    
Beginning balance, Unrealized Gain (Loss) on Derivatives       0   0.2 0.1 0.6    
Other comprehensive income (expense) before reclassifications, Unrealized Gain (Loss) on Derivatives     0.2   (0.4) 0 0.1      
Amounts reclassified from accumulated other comprehensive income, Unrealized Gain (Loss) on Derivatives     0   0 [1] 0 [2] 0 [1]      
Net current-period other comprehensive income (expense, Unrealized Gain (Loss) on Derivatives     0.2   (0.4) 0 0.1      
Ending balance, Unrealized Gain (Loss) on Derivatives     0.2   0.2 0.2 0.2 0.6    
Beginning balance, Total       (40.3)   (41.9) (80.1) (78.7)    
Other comprehensive income (expense) before reclassifications     (8.8)   1.8 (9.1) (0.5)      
Amounts reclassified from accumulated other comprehensive income     0.7   3.1 [1] 2.6 [2] 6.8 [1]      
Net current-period other comprehensive income (expense     (8.1)   4.9 (6.5) 6.3      
Ending balance, Total     (48.4)   (73.8) (48.4) (73.8) (78.7)    
Payments for Repurchase of Common Stock     $ 3.4 $ 3.3   $ 6.7 $ 0      
[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