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SUPPLEMENTARY GUARANTOR INFORMATION (Supplementary Statements of Condensed Consolidating Financial Position) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current Assets: |  |  |  |
Cash and cash equivalents | $ 352.6 | $ 823.2 | $ 978.3 | $ 312.8
Accounts receivable, net | 94.0 | 226.7 |  |
Inventories | 317.4 | 181.1 |  |
Derivative assets | 45.8 | 91.5 |  |
Income tax receivable, current | 58.6 | 117.3 |  |
Other current assets | 29.5 | 39.8 |  |
Total current assets | 897.9 | 1,479.6 |  |
Non-Current Assets: |  |  |  |
Property, plant and equipment, net | 1,929.0 | 1,286.0 |  |
Income tax receivable, non-current | 62.7 | 121.3 |  |
Deferred income taxes | 459.5 | 464.8 |  |
Investment in subsidiaries | 0.0 | 0.0 |  |
Long-term intercompany notes | 0.0 | 0.0 |  |
Other non-current assets | 154.7 | 177.9 |  |
TOTAL ASSETS | 3,503.8 | 3,529.6 | 2,953.4 |
Current liabilities: |  |  |  |
Accounts payable | 193.2 | 186.8 |  |
Accrued liabilities | 126.3 | 158.9 |  |
State and local taxes payable | 37.9 | 35.5 |  |
Other current liabilities | 52.0 | 87.0 |  |
Total current liabilities | 409.4 | 468.2 |  |
Non-current liabilities: |  |  |  |
Long-term debt | 2,113.8 | 2,092.9 |  |
Pension and OPEB liabilities | 311.5 | 248.7 |  |
Environmental and mine closure obligations | 164.9 | 172.0 |  |
LONG-TERM INTERCOMPANY NOTES | 0.0 | 0.0 |  |
Other non-current liabilities | 146.3 | 123.6 |  |
TOTAL LIABILITIES | 3,145.9 | 3,105.4 |  |
Equity: |  |  |  |
TOTAL EQUITY | 357.9 | 424.2 | (444.1) | (1,330.5)
TOTAL LIABILITIES AND EQUITY | 3,503.8 | 3,529.6 |  |
Consolidation, Eliminations [Member] |  |  |  |
Current Assets: |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.0 | 0.0
Accounts receivable, net | (4.2) | (4.1) |  |
Inventories | 0.0 | 0.0 |  |
Derivative assets | 0.0 | 0.0 |  |
Income tax receivable, current | 0.0 | 0.0 |  |
Other current assets | 0.0 | 0.0 |  |
Total current assets | (4.2) | (4.1) |  |
Non-Current Assets: |  |  |  |
Property, plant and equipment, net | 0.0 | 0.0 |  |
Income tax receivable, non-current | 0.0 | 0.0 |  |
Deferred income taxes | 0.0 | 0.0 |  |
Investment in subsidiaries | (1,868.3) | (1,313.1) |  |
Long-term intercompany notes | (121.3) | (121.3) |  |
Other non-current assets | 0.0 | 0.0 |  |
TOTAL ASSETS | (1,993.8) | (1,438.5) |  |
Current liabilities: |  |  |  |
Accounts payable | (4.2) | (4.1) |  |
Accrued liabilities | 0.0 | 0.0 |  |
State and local taxes payable | 0.0 | 0.0 |  |
Other current liabilities | 0.0 | 0.0 |  |
Total current liabilities | (4.2) | (4.1) |  |
Non-current liabilities: |  |  |  |
Long-term debt | 0.0 | 0.0 |  |
Pension and OPEB liabilities | 0.0 | 0.0 |  |
Environmental and mine closure obligations | 0.0 | 0.0 |  |
LONG-TERM INTERCOMPANY NOTES | (121.3) | (121.3) |  |
Other non-current liabilities | 0.0 | 0.0 |  |
TOTAL LIABILITIES | (125.5) | (125.4) |  |
Equity: |  |  |  |
TOTAL EQUITY | (1,868.3) | (1,313.1) |  |
TOTAL LIABILITIES AND EQUITY | (1,993.8) | (1,438.5) |  |
Parent [Member] | Reportable Legal Entities [Member] |  |  |  |
Current Assets: |  |  |  |
Cash and cash equivalents | 349.7 | 819.8 | 948.9 | 283.4
Accounts receivable, net | 4.9 | 9.2 |  |
Inventories | 0.0 | 0.0 |  |
Derivative assets | 0.0 | 0.1 |  |
Income tax receivable, current | 58.6 | 117.3 |  |
Other current assets | 9.1 | 10.0 |  |
Total current assets | 422.3 | 956.4 |  |
Non-Current Assets: |  |  |  |
Property, plant and equipment, net | 11.2 | 13.3 |  |
Income tax receivable, non-current | 58.6 | 117.2 |  |
Deferred income taxes | 458.3 | 463.6 |  |
Investment in subsidiaries | 1,821.1 | 1,262.3 |  |
Long-term intercompany notes | 0.0 | 0.0 |  |
Other non-current assets | 15.1 | 8.0 |  |
TOTAL ASSETS | 2,786.6 | 2,820.8 |  |
Current liabilities: |  |  |  |
Accounts payable | 5.7 | 5.3 |  |
Accrued liabilities | 80.7 | 92.7 |  |
State and local taxes payable | 0.0 | 0.0 |  |
Other current liabilities | 6.0 | 4.8 |  |
Total current liabilities | 92.4 | 102.8 |  |
Non-current liabilities: |  |  |  |
Long-term debt | 2,113.8 | 2,092.9 |  |
Pension and OPEB liabilities | 80.5 | 64.3 |  |
Environmental and mine closure obligations | 0.0 | 0.0 |  |
LONG-TERM INTERCOMPANY NOTES | 121.3 | 121.3 |  |
Other non-current liabilities | 20.7 | 15.3 |  |
TOTAL LIABILITIES | 2,428.7 | 2,396.6 |  |
Equity: |  |  |  |
TOTAL EQUITY | 357.9 | 424.2 |  |
TOTAL LIABILITIES AND EQUITY | 2,786.6 | 2,820.8 |  |
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Current Assets: |  |  |  |
Cash and cash equivalents | 0.1 | 0.7 | 2.1 | 2.5
Accounts receivable, net | 93.0 | 221.3 |  |
Inventories | 317.4 | 181.1 |  |
Derivative assets | 45.8 | 91.4 |  |
Income tax receivable, current | 0.0 | 0.0 |  |
Other current assets | 13.0 | 16.9 |  |
Total current assets | 469.3 | 511.4 |  |
Non-Current Assets: |  |  |  |
Property, plant and equipment, net | 1,867.1 | 1,221.9 |  |
Income tax receivable, non-current | 4.1 | 4.1 |  |
Deferred income taxes | 0.0 | 0.0 |  |
Investment in subsidiaries | 47.2 | 50.8 |  |
Long-term intercompany notes | 0.0 | 0.0 |  |
Other non-current assets | 121.4 | 153.8 |  |
TOTAL ASSETS | 2,509.1 | 1,942.0 |  |
Current liabilities: |  |  |  |
Accounts payable | 187.5 | 181.4 |  |
Accrued liabilities | 45.5 | 66.1 |  |
State and local taxes payable | 37.9 | 35.4 |  |
Other current liabilities | 38.6 | 74.1 |  |
Total current liabilities | 309.5 | 357.0 |  |
Non-current liabilities: |  |  |  |
Long-term debt | 0.0 | 0.0 |  |
Pension and OPEB liabilities | 496.9 | 414.4 |  |
Environmental and mine closure obligations | 145.6 | 152.1 |  |
LONG-TERM INTERCOMPANY NOTES | 0.0 | 0.0 |  |
Other non-current liabilities | 120.3 | 99.5 |  |
TOTAL LIABILITIES | 1,072.3 | 1,023.0 |  |
Equity: |  |  |  |
TOTAL EQUITY | 1,436.8 | 919.0 |  |
TOTAL LIABILITIES AND EQUITY | 2,509.1 | 1,942.0 |  |
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Current Assets: |  |  |  |
Cash and cash equivalents | 2.8 | 2.7 | $ 27.3 | $ 26.9
Accounts receivable, net | 0.3 | 0.3 |  |
Inventories | 0.0 | 0.0 |  |
Derivative assets | 0.0 | 0.0 |  |
Income tax receivable, current | 0.0 | 0.0 |  |
Other current assets | 7.4 | 12.9 |  |
Total current assets | 10.5 | 15.9 |  |
Non-Current Assets: |  |  |  |
Property, plant and equipment, net | 50.7 | 50.8 |  |
Income tax receivable, non-current | 0.0 | 0.0 |  |
Deferred income taxes | 1.2 | 1.2 |  |
Investment in subsidiaries | 0.0 | 0.0 |  |
Long-term intercompany notes | 121.3 | 121.3 |  |
Other non-current assets | 18.2 | 16.1 |  |
TOTAL ASSETS | 201.9 | 205.3 |  |
Current liabilities: |  |  |  |
Accounts payable | 4.2 | 4.2 |  |
Accrued liabilities | 0.1 | 0.1 |  |
State and local taxes payable | 0.0 | 0.1 |  |
Other current liabilities | 7.4 | 8.1 |  |
Total current liabilities | 11.7 | 12.5 |  |
Non-current liabilities: |  |  |  |
Long-term debt | 0.0 | 0.0 |  |
Pension and OPEB liabilities | (265.9) | (230.0) |  |
Environmental and mine closure obligations | 19.3 | 19.9 |  |
LONG-TERM INTERCOMPANY NOTES | 0.0 | 0.0 |  |
Other non-current liabilities | 5.3 | 8.8 |  |
TOTAL LIABILITIES | (229.6) | (188.8) |  |
Equity: |  |  |  |
TOTAL EQUITY | 431.5 | 394.1 |  |
TOTAL LIABILITIES AND EQUITY | $ 201.9 | $ 205.3 |  |

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