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Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest $ (6.3) $ (6.3) $ (21.8) $ (23.2)
Discontinued Operation, Tax Effect of Adjustment to Prior Period Gain (Loss) on Disposal (0.1) (0.1) (0.2) (0.1)
Adjustment for workers’ compensation, product liability, and other postretirement benefits related to previously discontinued operations (net of income tax expense) 0.2 0.1 0.4 0.1
Provision for environmental liabilities and legal reserves and expenses related to previously discontinued operations, net of recoveries (net of income tax benefit) (4.1) (4.2) (12.3) (11.1)
Provision for environmental liabilities and legal reserves and expenses related to previously discontinued operations, net of recoveries, before tax (2.4) [1] (2.2) [1] (9.9) [1] (12.2) [1]
Discontinued Operation, tax effect of provision for environmental and legal 1.5 1.4 6.0 7.5
Discontinued Operations, tax effect of provision for legal expenses $ 2.5 $ 2.5 $ 7.6 $ 6.8
[1] See a roll forward of our environmental reserves as well as discussion on significant environmental issues that occurred during the year in Note 11.