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Financial Information for Subsidiary and Guarantor Parent (B.S.) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 229.6 | $ 149.8 | $ 269.5 | $ 1,026.8
Accounts receivable, net | 452.1 | 400.3 |  |
Intercompany notes receivable | 0.0 | 0.0 |  |
Inventories, net | 1,037.0 | 1,271.6 |  |
Prepaid expenses and other current assets | 47.8 | 45.9 |  |
Total Current Assets | 1,766.5 | 1,867.6 |  |
Property, plant and equipment, net | 2,498.9 | 2,928.2 |  |
Goodwill | 641.9 | 651.4 |  |
Intercompany notes receivable | 0.0 | 0.0 |  |
Investments in subsidiaries | 0.0 | 0.0 |  |
Other assets | 262.7 | 304.5 |  |
Total Assets | 5,170.0 | 5,751.7 | 6,571.7 |
Accounts payable | 294.3 | 380.8 |  |
Accrued liabilities | 309.3 | 301.8 |  |
Intercompany notes payable | 0.0 | 0.0 |  |
Short-term debt and current portion of long-term debt | 105.1 | 3.9 |  |
Total Current Liabilities | 708.7 | 686.5 |  |
Long-term debt | 1,771.9 | 1,491.8 |  |
Intercompany notes payable | 0.0 | 0.0 |  |
Accrued postretirement benefits | 317.7 | 359.2 |  |
Pension liabilities | 827.9 | 833.8 |  |
Deferred income taxes | 15.6 | 75.6 |  |
Other long-term liabilities | 83.4 | 108.3 |  |
Total Liabilities | 3,725.2 | 3,555.2 |  |
Redeemable noncontrolling interest | 0.0 | 12.1 |  |
Total Stockholders’ Equity | 1,444.8 | 2,184.4 | $ 2,709.3 | $ 2,994.7
Total Liabilities and Stockholders’ Equity | 5,170.0 | 5,751.7 |  |
Legal Entities [Member] | Guarantor Parent [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 2.3 | 0.4 |  |
Accounts receivable, net | 0.1 | 0.1 |  |
Intercompany notes receivable | 0.0 | 0.0 |  |
Inventories, net | 0.0 | 0.0 |  |
Prepaid expenses and other current assets | 6.6 | 9.3 |  |
Total Current Assets | 9.0 | 9.8 |  |
Property, plant and equipment, net | 1.3 | 2.2 |  |
Goodwill | 0.0 | 0.0 |  |
Intercompany notes receivable | 0.0 | 0.0 |  |
Investments in subsidiaries | 5,241.2 | 5,742.5 |  |
Other assets | 23.0 | 13.4 |  |
Total Assets | 5,274.5 | 5,767.9 |  |
Accounts payable | 3.1 | 4.8 |  |
Accrued liabilities | 54.6 | 42.1 |  |
Intercompany notes payable | 1,341.1 | 1,325.4 |  |
Short-term debt and current portion of long-term debt | 0.4 | 0.7 |  |
Total Current Liabilities | 1,399.2 | 1,373.0 |  |
Long-term debt | 1,621.7 | 1,341.7 |  |
Intercompany notes payable | 0.0 | 0.0 |  |
Accrued postretirement benefits | 0.0 | 0.0 |  |
Pension liabilities | 778.5 | 778.0 |  |
Deferred income taxes | 15.6 | 75.6 |  |
Other long-term liabilities | 14.7 | 15.2 |  |
Total Liabilities | 3,829.7 | 3,583.5 |  |
Redeemable noncontrolling interest |  | 0.0 |  |
Total Stockholders’ Equity | 1,444.8 | 2,184.4 |  |
Total Liabilities and Stockholders’ Equity | 5,274.5 | 5,767.9 |  |
Legal Entities [Member] | Subsidiary [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 2.5 | 2.8 |  |
Accounts receivable, net | 107.8 | 100.3 |  |
Intercompany notes receivable | 0.0 | 0.0 |  |
Inventories, net | 106.7 | 239.9 |  |
Prepaid expenses and other current assets | 5.2 | 3.8 |  |
Total Current Assets | 222.2 | 346.8 |  |
Property, plant and equipment, net | 1,583.6 | 1,559.9 |  |
Goodwill | 0.0 | 0.0 |  |
Intercompany notes receivable | 0.0 | 0.0 |  |
Investments in subsidiaries | 37.7 | 37.7 |  |
Other assets | 25.5 | 23.0 |  |
Total Assets | 1,869.0 | 1,967.4 |  |
Accounts payable | 97.4 | 171.1 |  |
Accrued liabilities | 83.3 | 74.0 |  |
Intercompany notes payable | 1,551.8 | 1,276.1 |  |
Short-term debt and current portion of long-term debt | 0.3 | 0.1 |  |
Total Current Liabilities | 1,732.8 | 1,521.3 |  |
Long-term debt | 150.0 | 149.7 |  |
Intercompany notes payable | 200.0 | 200.0 |  |
Accrued postretirement benefits | 244.0 | 280.0 |  |
Pension liabilities | 5.2 | 5.2 |  |
Deferred income taxes | 0.0 | 0.0 |  |
Other long-term liabilities | 18.1 | 20.7 |  |
Total Liabilities | 2,350.1 | 2,176.9 |  |
Redeemable noncontrolling interest |  | 0.0 |  |
Total Stockholders’ Equity | (481.1) | (209.5) |  |
Total Liabilities and Stockholders’ Equity | 1,869.0 | 1,967.4 |  |
Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 224.8 | 146.6 |  |
Accounts receivable, net | 344.2 | 299.9 |  |
Intercompany notes receivable | 2,892.9 | 2,601.5 |  |
Inventories, net | 930.3 | 1,031.7 |  |
Prepaid expenses and other current assets | 36.0 | 32.8 |  |
Total Current Assets | 4,428.2 | 4,112.5 |  |
Property, plant and equipment, net | 914.0 | 1,366.1 |  |
Goodwill | 641.9 | 651.4 |  |
Intercompany notes receivable | 200.0 | 200.0 |  |
Investments in subsidiaries | 0.0 | 0.0 |  |
Other assets | 214.2 | 268.1 |  |
Total Assets | 6,398.3 | 6,598.1 |  |
Accounts payable | 193.8 | 204.9 |  |
Accrued liabilities | 171.4 | 185.7 |  |
Intercompany notes payable | 0.0 | 0.0 |  |
Short-term debt and current portion of long-term debt | 104.4 | 3.1 |  |
Total Current Liabilities | 469.6 | 393.7 |  |
Long-term debt | 0.2 | 0.4 |  |
Intercompany notes payable | 0.0 | 0.0 |  |
Accrued postretirement benefits | 73.7 | 79.2 |  |
Pension liabilities | 44.2 | 50.6 |  |
Deferred income taxes | 0.0 | 0.0 |  |
Other long-term liabilities | 50.6 | 72.4 |  |
Total Liabilities | 638.3 | 596.3 |  |
Redeemable noncontrolling interest |  | 12.1 |  |
Total Stockholders’ Equity | 5,760.0 | 5,989.7 |  |
Total Liabilities and Stockholders’ Equity | 6,398.3 | 6,598.1 |  |
Eliminations [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 |  |
Accounts receivable, net | 0.0 | 0.0 |  |
Intercompany notes receivable | (2,892.9) | (2,601.5) |  |
Inventories, net | 0.0 | 0.0 |  |
Prepaid expenses and other current assets | 0.0 | 0.0 |  |
Total Current Assets | (2,892.9) | (2,601.5) |  |
Property, plant and equipment, net | 0.0 | 0.0 |  |
Goodwill | 0.0 | 0.0 |  |
Intercompany notes receivable | (200.0) | (200.0) |  |
Investments in subsidiaries | (5,278.9) | (5,780.2) |  |
Other assets | 0.0 | 0.0 |  |
Total Assets | (8,371.8) | (8,581.7) |  |
Accounts payable | 0.0 | 0.0 |  |
Accrued liabilities | 0.0 | 0.0 |  |
Intercompany notes payable | (2,892.9) | (2,601.5) |  |
Short-term debt and current portion of long-term debt | 0.0 | 0.0 |  |
Total Current Liabilities | (2,892.9) | (2,601.5) |  |
Long-term debt | 0.0 | 0.0 |  |
Intercompany notes payable | (200.0) | (200.0) |  |
Accrued postretirement benefits | 0.0 | 0.0 |  |
Pension liabilities | 0.0 | 0.0 |  |
Deferred income taxes | 0.0 | 0.0 |  |
Other long-term liabilities | 0.0 | 0.0 |  |
Total Liabilities | (3,092.9) | (2,801.5) |  |
Redeemable noncontrolling interest |  | 0.0 |  |
Total Stockholders’ Equity | (5,278.9) | (5,780.2) |  |
Total Liabilities and Stockholders’ Equity | $ (8,371.8) | $ (8,581.7) |  |

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