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Commitments and Contingencies - Summary of Net Asbestos Charges (Detail) (Asbestos Related Matters [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Asbestos Related Contingencies [Line Items]      
Net asbestos charge $ 45.8 $ 94.0 $ 375.1
Continuing Operations [Member]
      
Asbestos Related Contingencies [Line Items]      
Asbestos provision 53.8 59.5 55.3
Asbestos remeasurement, net 2.9 40.9 329.5
Settlement Agreement (5.8)    
Net asbestos charge 50.9 100.4 384.8
Discontinued Operations [Member]
      
Asbestos Related Contingencies [Line Items]      
Asbestos provision 0.5 2.8  
Asbestos remeasurement, net   (9.2) (9.7)
Settlement Agreement (5.6)    
Net asbestos charge $ (5.1) $ (6.4) $ (9.7)