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Restructuring Actions (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]  
Restructuring reserve, beginning balance $ 0.9
Restructuring reserve, period expense 22.4
Restructuring reserve, settled with cash (21.9)
Restructuring reserve, accrual adjustment (0.4)
Restructuring reserve, ending balance 1.0
One-time Termination Benefits [Member]
  
Restructuring Cost and Reserve [Line Items]  
Restructuring reserve, beginning balance 0.3
Restructuring reserve, period expense 1.7
Restructuring reserve, settled with cash (1.2)
Restructuring reserve, accrual adjustment (0.4)
Restructuring reserve, ending balance 0.4
Environmental Restoration Costs [Member]
  
Restructuring Cost and Reserve [Line Items]  
Restructuring reserve, beginning balance 0.6
Restructuring reserve, period expense 0
Restructuring reserve, settled with cash 0
Restructuring reserve, accrual adjustment 0
Restructuring reserve, ending balance 0.6
Other Restructuring Actions [Member]
  
Restructuring Cost and Reserve [Line Items]  
Restructuring reserve, beginning balance 0
Restructuring reserve, period expense 20.7
Restructuring reserve, settled with cash (20.7)
Restructuring reserve, accrual adjustment 0
Restructuring reserve, ending balance $ 0