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Commitments And Contingencies - Rollforward of Environmental Liability and Related Assets (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Environmental Liability And Related Assets [Line items]  
Environmental liability - Beginning balance $ 101.8
Continuing operations, Liability 4.0
Discontinued operations, Liability (0.7)
Accruals added during the period for new matters, Liability   
Payments, Liability (7.8)
Environmental liability - Ending balance 97.3
Continuing operations 6.5
Discontinued operations 1.4
Accruals added during the period for new matters   
Payments, Asset (0.1)
Environmental liability - Asset, Ending balance 7.8
Environmental liability - Net, Beginning balance 101.8
Continuing Operation, Net (2.5)
Discontinued operations, Net (2.1)
Accruals added during the period, Net   
Payments, Net (7.7)
Environmental liability - Net, Ending balance $ 89.5