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Contingencies Enviromental liabilities rollforward (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Reserve for Environmental Costs [Member]
Dec. 31, 2010
Reserve for Environmental Costs [Member]
Dec. 31, 2009
Reserve for Environmental Costs [Member]
Dec. 31, 2011
Reserve for Environmental Costs [Member]
Dec. 31, 2011
Formal cost share [Member]
Dec. 31, 2011
Indemnification Agreement [Member]
Dec. 31, 2011
Other Reserves [Member]
Other Unrecorded Amounts               $ 1.8 $ 2.4 $ 0.2
Beginning Balance 32.9     14.3 14.7 6.5 15.0      
Adjusted to expense (income) during the year 11.5 2.5 (3.3) 1.5 0.3 8.7        
Payments made       (0.8) (0.7) (0.5)        
Ending Balance $ 21.2 $ 32.9     $ 14.3 $ 14.7 $ 15.0