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Long-Term Debt Leases (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sale Leaseback Transaction, Net Book Value $ 13.2    
Sale Leaseback Transaction, Net Proceeds 12.1 0 0
Operating Leases, Future Minimum Payments Due, Current 9.6    
Operating Leases, Future Minimum Payments, Due in Two Years 8.3    
Operating Leases, Future Minimum Payments, Due in Three Years 7.1    
Operating Leases, Future Minimum Payments, Due in Four Years 5.8    
Operating Leases, Future Minimum Payments, Due in Five Years 4.1    
Operating Leases, Rent Expense, Net 9.0 6.8 5.3
Purchase of Previously Idled Assets, Reduction of Cost of Goods Sold   0.5 2.3
Capital Lease Obligations [Member]
      
Capital Leased Assets, Gross 6.7 16.1  
Capital Leases, Balance Sheet, Assets by Major Class, Net $ 5.6 $ 6.0