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Supplemental Balance Sheet Information Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Supplemental Balance Sheet Disclosures [Table Text Block] | Supplemental Balance Sheet Information
|  | December 31, 2015 |  | December 31, 2014
|  | (In millions of dollars)
Cash and Cash Equivalents |  |  |  |
Cash and money market funds |  | $ | 40.3 |  |  | $ | 29.5 |
Commercial paper |  | 32.2 |  |  | 148.2 |
Total |  | $ | 72.5 |  |  | $ | 177.7 |
|  | December 31, 2015 |  | December 31, 2014
|  | (In millions of dollars)
Trade Receivables – Net |  |  |  |
Billed trade receivables |  | $ | 116.8 |  |  | $ | 128.7 |
Unbilled trade receivables |  | 0.7 |  |  | 1.4 |
Trade receivables, gross |  | 117.5 |  |  | 130.1 |
Allowance for doubtful receivables |  | (0.8 | ) |  | (0.8 | )
Trade receivables – net |  | $ | 116.7 |  |  | $ | 129.3 |
Inventories |  |  |  |
Finished products |  | $ | 79.5 |  |  | $ | 73.6 |
Work-in-process |  | 63.6 |  |  | 66.7 |
Raw materials |  | 53.4 |  |  | 54.2 |
Operating supplies and repair and maintenance parts |  | 23.1 |  |  | 20.2 |
Total |  | $ | 219.6 |  |  | $ | 214.7 |
Prepaid Expenses and Other Current Assets |  |  |  |
Current derivative assets – Notes 10 and 11 |  | $ | 1.5 |  |  | $ | 85.7 |
Current deferred tax assets |  | 49.6 |  |  | 86.4 |
Prepaid insurance |  | 1.9 |  |  | 2.0 |
Short-term restricted cash |  | 0.3 |  |  | 0.3 |
Other |  | 3.4 |  |  | 4.2 |
Total |  | $ | 56.7 |  |  | $ | 178.6 |
Property, Plant and Equipment – Net |  |  |  |
Land and improvements |  | $ | 22.7 |  |  | $ | 22.9 |
Buildings and leasehold improvements |  | 71.8 |  |  | 63.8 |
Machinery and equipment |  | 549.0 |  |  | 509.8 |
Construction in progress |  | 48.5 |  |  | 25.2 |
Property, plant and equipment – gross |  | 692.0 |  |  | 621.7 |
Accumulated depreciation |  | (196.9 | ) |  | (166.8 | )
Assets held for sale |  | 0.3 |  |  | — |
Property, plant and equipment – net |  | $ | 495.4 |  |  | $ | 454.9 |
Other Assets |  |  |  |
Restricted cash |  | $ | 10.9 |  |  | $ | 10.0 |
Deferred financing costs |  | 4.5 |  |  | 5.9 |
Deferred compensation plan assets |  | 7.3 |  |  | 7.3 |
Derivative assets – Notes 10 and 11 |  | 0.1 |  |  | — |
Other |  | — |  |  | 0.1 |
Total |  | $ | 22.8 |  |  | $ | 23.3 |
|  | December 31, 2015 |  | December 31, 2014
|  | (In millions of dollars)
Other Accrued Liabilities |  |  |  |
Current derivative liabilities – Notes 10 and 11 |  | $ | 14.1 |  |  | $ | 94.9 |
Uncleared cash disbursements |  | 8.0 |  |  | 9.1 |
Accrued income taxes and taxes payable |  | 3.1 |  |  | 5.2 |
Accrued annual contribution to VEBAs |  | 19.6 |  |  | 13.7 |
Short-term environmental accrual – Note 9 |  | 1.6 |  |  | 2.3 |
Accrued interest |  | 1.5 |  |  | 3.7 |
Short-term deferred revenue – Note 1 |  | 1.2 |  |  | 0.2 |
Other |  | 3.6 |  |  | 3.7 |
Total |  | $ | 52.7 |  |  | $ | 132.8 |
Long-Term Liabilities |  |  |  |
Derivative liabilities – Notes 10 and 11 |  | $ | 2.1 |  |  | $ | 1.9 |
Income tax liabilities |  | 0.7 |  |  | 2.4 |
Workers’ compensation accruals |  | 21.7 |  |  | 21.5 |
Long-term environmental accrual – Note 9 |  | 17.0 |  |  | 17.0 |
Long-term asset retirement obligations |  | 4.8 |  |  | 4.4 |
Long-term deferred revenue – Note 1 |  | 0.3 |  |  | 0.5 |
Deferred compensation liability |  | 7.7 |  |  | 7.2 |
Long-term capital leases |  | 0.1 |  |  | 0.1 |
Long-term portion of contingent contribution to Union VEBA – Note 6 |  | 29.9 |  |  | — |
Other long-term liabilities |  | 3.2 |  |  | 3.3 |
Total |  | $ | 87.5 |  |  | $ | 58.3 |

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