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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Accrued environmental remediation and related costs    
Balance at the beginning of the year $ 43.2  
Additions charged to expense, net 14.0  
Payments, net (2.0)  
Balance at the end of the period 55.2  
Amounts recognized in our Condensed Consolidated Balance Sheet at the end of the period:    
Current liabilities 10.5 8.6
Noncurrent liabilities 44.7 34.6
Total $ 55.2