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Commitments and Contingencies - Rollforward of Environmental Liability and Related Assets (Detail) (Environmental Related Matters [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Environmental Related Matters [Member] |  |  |
Environmental Liability And Related Assets [Line items] |  |  |
Environmental liability - Beginning balance | $ 99.7 | $ 101.8 |
Continuing operations, Liability | 13.0 | 7.1 |
Discontinued operations, Liability | 0.5 | (1.4) |
Accruals added during the period for new matters, Liability |  |  |
Net cash activity, Liability | (11.4) | (11.5) |
Foreign currency, Liability |  | 0.1 |
Environmental liability - Ending balance | 101.8 | 96.1 | 101.8
Environmental liability - Asset, Beginning balance |  |  |
Continuing operations, Asset |  | 10.8 |
Discontinued operations, Asset |  | 1.5 |
Accruals added during the period for new matters, Asset |  |  |
Net cash activity, Asset |  |  |
Foreign currency, Asset |  |  |
Environmental liability - Asset, Ending balance |  | 12.3 |
Environmental liability - Net, Beginning balance |  | 101.8 | 99.7
Continuing Operation, Net |  | (3.7) | 13.0
Discontinued operations, Net |  | (2.9) | 0.5
Accruals added during the period for new matters, Net |  |  |
Net cash activity, Net |  | (11.5) | (11.4)
Foreign currency, Net |  | 0.1 |
Environmental liability - Net, Ending balance | $ 101.8 | $ 83.8 | $ 101.8

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