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Long-Term Debt Leases (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating Leases, Future Minimum Payments Due, Current $ 5.2 $ 5.2    
Operating Leases, Future Minimum Payments, Due in Two Years 4.0 4.0    
Operating Leases, Future Minimum Payments, Due in Three Years 3.5 3.5    
Operating Leases, Future Minimum Payments, Due in Four Years 2.1 2.1    
Operating Leases, Future Minimum Payments, Due in Five Years 1.4 1.4    
Operating Leases, Rent Expense, Net   6.8 5.3 33.4
Idling of Leased Assets, Expense Recorded During the Period       21.1
Purchase of Previously Idled Assets, Reduction of Cost of Goods Sold $ 0.5   $ 2.3