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Commitments and Contingencies Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Environmental accrual rollforward
The following table presents the changes in such accruals, which are primarily included in Long-term liabilities.
 
 
Year Ended December 31,
 
 
2012
 
2011
 
2010
Beginning balance
 
$
22.0

 
$
20.2

 
$
9.7

Additional accruals
 
1.2

 
3.9

 
13.9

Less expenditures
 
(1.5
)
 
(2.1
)
 
(3.4
)
Ending balance
 
$
21.7

 
$
22.0

 
$
20.2