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Supplemental Balance Sheet Information (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Cash and cash equivalents.        
Cash and money market funds $ 135.4 $ 49.8    
Commercial paper 120.2 0    
Total 255.6 49.8 23.6 135.6
Trade Receivables.        
Billed trade receivables 150.5 98.9    
Unbilled trade receivables - Note 1 6.6 0.9    
Trade receivables, gross 157.1 99.8    
Allowance for doubtful receivables (0.7) (0.9)    
Trade receivables, net 156.4 98.9    
Inventories.        
Finished products 60.4 75.9    
Work-in-process 66.0 57.5    
Raw materials 46.3 58.1    
Operating supplies and repairs and maintenance parts 16.3 14.2    
Total 189.0 205.7    
Prepaid Expenses and Other Current Assets.        
Current derivative assets - Notes 10 and 11 2.6 0    
Current deferred tax assets 63.0 63.0    
Current portion of option premiums paid - Notes 10 and 11 0.2 0.4    
Short-term restricted cash 1.3 7.8    
Prepaid taxes 1.4 3.8    
Prepaid expenses 4.6 3.9    
Total 73.1 78.9    
Property, Plant and Equipment - Net.        
Land and improvements 22.6 22.6    
Buildings and leasehold improvements 50.5 45.9    
Machinery and equipment 391.6 356.7    
Construction in progress 9.8 24.1    
Active property, plant and equipment, gross 474.5 449.3    
Accumulated depreciation (105.2) (86.9)    
Active property, plant and equipment, net 369.3 362.4    
Idled equipment 5.4 5.4    
Total 374.7 367.8    
Other Assets.        
Derivative assets - Notes 10 and 11 52.9 46.2    
Option premiums paid - Notes 10 and 11 0 0.1    
Restricted cash 10.1 10.4    
Long-term income tax receivable 2.9 2.8    
Deferred financing costs 12.5 7.8    
Available for sale securities 5.7 4.9    
Other 0.1 0.1    
Total 84.2 72.3    
Other Accrued Liabilities.        
Current derivative liabilities - Notes 10 and 11 4.0 14.8    
Current portion of option premiums received - Notes 10 and 11 0.1 0.1    
Accrued book overdraft (uncleared cash disbursement) 4.0 0    
Taxes payable 4.5 2.6    
Accrued freight 2.3 2.4    
Short-term environmental accrual - Note 9 2.3 1.2    
Accrued interest 10.7 2.3    
Short-term deferred revenue - Note 1 9.2 13.5    
Other 4.8 4.1    
Total 41.9 41.0    
Long-term Liabilities.        
Derivative liabilities - Notes 10 and 11 59.2 55.5    
Option premiums received - Notes 10 and 11 0 0.1    
Income tax liabilities 14.6 13.4    
Workers' compensation accruals 20.8 20.8    
Long-term environmental accrual - Note 9 19.6 20.8    
Long-term asset retirement obligations 3.9 3.8    
Long-term deferred revenue - Note 1 0.8 3.3    
Deferred compensation liability 5.9 5.1    
Other long-term liabilities 3.5 3.2    
Total $ 128.3 $ 126.0