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Commitments and Contingencies (Details 3) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Rollforward of environmental liability and related assets    
Environmental liability- December 31 $ 101.8  
Environmental Asset- December 31 0  
Change in estimates for pre-existing accruals    
Continuing Operation, Liability 1.7  
Continuing Operation, Asset 6.7  
Continuing Operation, Net (5.0)  
Discontinued Operation, Liability (0.8)  
Discontinued Operation, Asset 1.5  
Discontinued Operation, Net (2.3)  
Accruals added during the period for new matters, Liability 0  
Accruals added during the period, Asset 0  
Accruals added during the period, Net 0  
Payments, Liability (5.8)  
Payments, Asset 0  
Payments, Net (5.8)  
Environmental liability - June 30, 2012 96.9  
Environmental Asset - June 30, 2012 8.2  
Environmental Net $ 88.7 $ 101.8