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Commitments And Contingencies - Roll Forward of Asbestos Liability and Related Assets (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Asbestos Related Contingencies [Line Items]  
Balance, Beginning $ 713.7
Changes in estimate during the period:  
Continuing operations 40.9
Discontinued operations 0.7
Settlement Agreement (11.4)
Net cash activity (28.2)
Balance, Ending 715.7
Current portion   
Noncurrent portion   
Asset [Member]
 
Asbestos Related Contingencies [Line Items]  
Balance, Beginning 954.2
Changes in estimate during the period:  
Continuing operations (53.7)
Discontinued operations 11.0
Settlement Agreement (233.8)
Net cash activity (46.7)
Balance, Ending 631.0
Current portion 94.2
Noncurrent portion 536.8
Liability [Member]
 
Asbestos Related Contingencies [Line Items]  
Balance, Beginning 1,667.9
Changes in estimate during the period:  
Continuing operations (12.8)
Discontinued operations 11.7
Settlement Agreement (245.2)
Net cash activity (74.9)
Balance, Ending 1,346.7
Current portion 92.5
Noncurrent portion $ 1,254.2