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Restructuring Actions (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve, beginning balance $ 0.9 $ 0.9
Restructuring reserve, period expense 13.9  
Restructuring reserve, accrual adjustment (12.7)  
Restructuring reserve, ending balance 2.1  
Effect on future cash flows, amount   2.1
One-time Termination Benefits [Member]
    
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve, beginning balance 0.3 0.3
Restructuring reserve, period expense 1.7  
Restructuring reserve, settled with cash (0.5)  
Restructuring reserve, ending balance 1.5  
Environmental Restoration Costs [Member]
    
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve, beginning balance 0.6 0.6
Restructuring reserve, period expense 0  
Restructuring reserve, settled with cash 0  
Restructuring reserve, ending balance 0.6  
Other Restructuring Actions [Member]
    
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve, beginning balance 0 0
Restructuring reserve, period expense 12.2  
Restructuring reserve, settled with cash (12.2)  
Restructuring reserve, ending balance $ 0