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Commitments And Contingencies - Net Asbestos Charges (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Asbestos Related Contingencies [Line Items]        
Net asbestos charge $ 7.2 $ 50.1 $ 30.2 $ 84.4
Net asbestos charge - continuing operations 4.5 31.3 18.8 56.2
Continuing Operations [Member]
        
Asbestos Related Contingencies [Line Items]        
Provision 15.7 18.4 38.0 49.9
Remeasurement 2.9 40.9 2.9 40.9
Settlement Agreement (5.8)   (5.8)  
Net asbestos charge 12.8 59.3 35.1 90.8
Provision 9.8 11.5 23.7 34.6
Remeasurement 1.8 25.6 1.8 25.6
Settlement Agreement (3.6)   (3.6)  
Net asbestos charge - continuing operations 8.0 37.1 21.9 60.2
Discontinued Operations [Member]
        
Asbestos Related Contingencies [Line Items]        
Provision     0.7 2.8
Settlement Agreement (5.6) (9.2) (5.6) (9.2)
Net asbestos charge (5.6) (9.2) (4.9) (6.4)
Provision     0.4 1.8
Settlement Agreement (3.5) (5.8) (3.5) (5.8)
Net asbestos charge - continuing operations $ (3.5) $ (5.8) $ (3.1) $ (4.0)