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Property, Plant and Equipment Property, Plant and Equipment (Tables) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]        
Property, Plant and Equipment, Gross $ 368.1 $ 368.1 $ 1,545.3 $ 1,582.7
Property, Plant and Equipment, Additions   0 13.9 135.9
Property, Plant and Equipment, Transfers and Changes   (63.0) (1,191.1) (173.3)
Property, Plant and Equipment, Gross   305.1 368.1 1,545.3
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (317.1) (317.1) (358.2) (351.3)
Depreciation   (23.3) (27.0) (42.7)
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment   43.2 68.1 35.8
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment   (297.2) (317.1) (358.2)
Property, Plant and Equipment, Net 51.0 51.0 1,187.1 1,231.4
Property, Plant And Equipment, Net Capital Expenditures   (23.3) (13.1) 93.2
Accumulated Depreciation, Depletion and Amortization, Write-down of Property, Plant and Equipment   (19.8) (1,123.0) (137.5)
Asset Retirement Charges 19.8 19.8    
Property, Plant and Equipment, Net   7.9 51.0 1,187.1
Construction in Progress [Member]
        
Property, Plant and Equipment [Line Items]        
Property, Plant and Equipment, Gross 2.7 2.7 1,111.2 1,126.3
Property, Plant and Equipment, Additions   0 13.6 135.9
Property, Plant and Equipment, Transfers and Changes   (2.7) (1,122.1) (151.0)
Property, Plant and Equipment, Gross   0 2.7 1,111.2
Leasehold Improvements [Member]
        
Property, Plant and Equipment [Line Items]        
Property, Plant and Equipment, Gross 183.7 183.7 182.9 187.3
Property, Plant and Equipment, Additions   0 0 0
Property, Plant and Equipment, Transfers and Changes   (42.6) 0.8 (4.4)
Property, Plant and Equipment, Gross   141.1 183.7 182.9
Machinery and Equipment [Member]
        
Property, Plant and Equipment [Line Items]        
Property, Plant and Equipment, Gross 181.7 181.7 251.2 269.1
Property, Plant and Equipment, Additions   0 0.3 0
Property, Plant and Equipment, Transfers and Changes   (17.7) (69.8) (17.9)
Property, Plant and Equipment, Gross   $ 164.0 $ 181.7 $ 251.2