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Restructuring Actions (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance $ 0.9 $ 14.8 $ 30.6
Restructuring Reserve, Period Expense   15.8 9.0
Restructuring Reserve, Settled with Cash   (16.0) (13.0)
Restructuring Reserve, Settled without Cash   (8.7) (8.7)
Restructuring Reserve, Accrual Adjustment   5.0 3.1
Restructuring Reserve, Ending Balance   0.9 14.8
Payments to Acquire Equipment on Lease   18.6  
Effect on Future Cash Flows, Amount 0.9    
One-time Termination Benefits [Member]
      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance   1.2 8.0
Restructuring Reserve, Period Expense   0.1 0
Restructuring Reserve, Settled with Cash   (0.9) (6.0)
Restructuring Reserve, Settled without Cash   0 0
Restructuring Reserve, Accrual Adjustment   0.1 0.8
Restructuring Reserve, Ending Balance   0.3 1.2
Impairment in Value of Asset [Member]
      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance   0 0
Restructuring Reserve, Period Expense   8.1 8.4
Restructuring Reserve, Settled with Cash   0 0
Restructuring Reserve, Settled without Cash   (8.1) (8.4)
Restructuring Reserve, Accrual Adjustment   0 0
Restructuring Reserve, Ending Balance   0 0
Indirect Inventory Obsolescence [Member]
      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance   0 0
Restructuring Reserve, Period Expense   0.6 0.3
Restructuring Reserve, Settled with Cash   0 0
Restructuring Reserve, Settled without Cash   (0.6) (0.3)
Restructuring Reserve, Accrual Adjustment   0 0
Restructuring Reserve, Ending Balance   0 0
Environmental Restoration Costs [Member]
      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance   1.4 1.3
Restructuring Reserve, Period Expense   0.1 0.1
Restructuring Reserve, Settled with Cash   (1.0) 0
Restructuring Reserve, Settled without Cash   0 0
Restructuring Reserve, Accrual Adjustment   (0.1) 0
Restructuring Reserve, Ending Balance   0.6 1.4
Contract Termination [Member]
      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance   12.2 21.3
Restructuring Reserve, Period Expense   0 0
Restructuring Reserve, Settled with Cash   (7.2) (6.8)
Restructuring Reserve, Settled without Cash   0 0
Restructuring Reserve, Accrual Adjustment   5.0 2.3
Restructuring Reserve, Ending Balance   0 12.2
Payments to Acquire Equipment on Lease   18.6 4.0
Other Restructuring Actions [Member]
      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance   0 0
Restructuring Reserve, Period Expense   6.9 0.2
Restructuring Reserve, Settled with Cash   (6.9) (0.2)
Restructuring Reserve, Settled without Cash   0 0
Restructuring Reserve, Accrual Adjustment   0 0
Restructuring Reserve, Ending Balance   $ 0 $ 0