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Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, Pension Benefit Plan Costs $ (91.0)  
Other comprehensive income (expense) before reclassifications, Pension Benefit Plan Costs 1.4  
Amounts reclassified from accumulated other comprehensive income, Pension Benefit Plan Costs 1.9 [1]  
Net current-period other comprehensive income (expense, Pension Benefit Plan Costs 3.3 0.9
Ending balance, Pension Benefit Plan Costs (87.7)  
Beginning balance, Foreign Currency 10.8  
Other comprehensive income (expense) before reclassifications, Foreign Currency (5.4)  
Amounts reclassified from accumulated other comprehensive income, Foreign Currency (0.3) [1]  
Net current-period other comprehensive income (expense, Foreign Currency (5.7) 5.2
Ending balance, Foreign Currency 5.1  
Beginning balance, Unrealized Gain (Loss) on Derivatives 0.1  
Other comprehensive income (expense) before reclassifications, Unrealized Gain (Loss) on Derivatives (0.6)  
Amounts reclassified from accumulated other comprehensive income, Unrealized Gain (Loss) on Derivatives    [1]  
Net current-period other comprehensive income (expense, Unrealized Gain (Loss) on Derivatives (0.6) 0.4
Ending balance, Unrealized Gain (Loss) on Derivatives (0.5)  
Beginning balance, Total (80.1)  
Other comprehensive income (expense) before reclassifications (4.6)  
Amounts reclassified from accumulated other comprehensive income 1.6 [1]  
Net current-period other comprehensive income (expense (3.0)  
Ending balance, Total $ (83.1)  
[1] Represents $2.0 million of costs included in net postretirement pension expense, net of income tax benefit of $0.1 million, and $0.3 million of foreign currency effects related to the FSTech disposal included in gain from discontinued operations and disposal.