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Guarantor Subsidiaries (Consolidating Balance Sheet) (Details) - USD ($) $ / shares in Units, $ in Millions | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2013
--- | --- | --- | --- | --- | --- | --- | ---
Current assets |  |  |  |  |  |  |
Cash and cash equivalents | $ 403.6 |  | $ 280.3 |  |  |  |
Accounts receivable—trade, less allowance for doubtful accounts | 161.3 |  | 172.9 |  |  |  |
Inventories, at lower of cost or market | 257.7 |  | 227.6 |  |  |  |
Prepaid expenses and other current assets | 17.7 |  | 30.0 |  |  |  |
Total current assets | 840.3 |  | 710.8 |  |  |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization | 1,834.3 |  | 1,807.3 |  |  |  |
Investments in subsidiaries | 0.0 |  | 0.0 |  |  |  |
Other assets | 186.1 |  | 169.1 |  |  |  |
Total assets | 2,860.7 |  | 2,687.2 |  |  |  |
Current liabilities |  |  |  |  |  |  |
Current maturities of long-term debt | 51.2 |  | 38.8 |  |  |  |
Inter-company accounts payable | 0.0 |  | 0.0 |  |  |  |
Trade accounts payable and accrued liabilities | 461.7 |  | 466.2 |  |  |  |
Income taxes payable | 40.8 |  | 0.0 |  |  |  |
Total current liabilities | 553.7 |  | 505.0 |  |  |  |
Long-term debt, including capitalized lease obligations | 975.3 |  | 999.3 |  |  |  |
Deferred income taxes | 225.2 |  | 216.7 |  |  |  |
Asset retirement obligations | 33.7 |  | 32.8 |  |  |  |
Deferred credits and other liabilities | 154.8 |  | 130.4 |  |  |  |
Total liabilities | 1,942.7 |  | 1,884.2 |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Preferred Stock | 0.0 |  | 0.0 |  |  |  |
Common Stock | 0.5 |  | 0.5 |  |  |  |
Treasury Stock | (1,235.2) |  | (1,099.8) |  |  |  |
Additional paid in capital (APIC) | 533.0 |  | 538.7 |  |  |  |
Retained earnings | 1,622.2 |  | 1,362.9 |  |  |  |
Accumulated other comprehensive income (loss) (AOCI) | (2.5) |  | 0.7 |  |  |  |
Total stockholders' equity | 918.0 | $ 746.8 | 803.0 | $ 816.3 | $ 797.8 | $ 807.3 |
Total liabilities and stockholders' equity | 2,860.7 |  | 2,687.2 |  |  |  |
Allowance for doubtful accounts | 0.1 |  | 1.2 |  |  |  |
Property, plant and equipment, accumulated depreciation and amortization | $ 1,143.6 |  | $ 1,079.2 |  |  |  |
Preferred stock par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  |  |
Preferred stock shares authorized (in shares) | 20,000,000 |  | 20,000,000 |  |  |  |
Preferred stock shares outstanding (in shares) | 0 |  | 0 |  |  |  |
Common stock par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  |  | $ 0.01
Common stock shares authorized (in shares) | 200,000,000 |  | 200,000,000 |  |  |  |
Common stock shares issued (in shares) | 46,767,164 |  | 46,767,164 |  |  |  |
Treasury stock, shares held (in shares) | 17,589,533 |  | 16,307,048 |  |  |  |
Eliminations |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |
Cash and cash equivalents | $ 0.0 |  | $ 0.0 |  |  |  |
Accounts receivable—trade, less allowance for doubtful accounts | 0.0 |  | 0.0 |  |  |  |
Inventories, at lower of cost or market | 0.0 |  | 0.0 |  |  |  |
Prepaid expenses and other current assets | 0.0 |  | 0.0 |  |  |  |
Total current assets | 0.0 |  | 0.0 |  |  |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization | 0.0 |  | 0.0 |  |  |  |
Investments in subsidiaries | (2,993.6) |  | (2,735.7) |  |  |  |
Other assets | 0.0 |  | 0.0 |  |  |  |
Total assets | (2,993.6) |  | (2,735.7) |  |  |  |
Current liabilities |  |  |  |  |  |  |
Current maturities of long-term debt | 0.0 |  | 0.0 |  |  |  |
Inter-company accounts payable | 0.0 |  | 0.0 |  |  |  |
Trade accounts payable and accrued liabilities | 0.0 |  | 0.0 |  |  |  |
Income taxes payable | 0.0 |  |  |  |  |  |
Total current liabilities | 0.0 |  | 0.0 |  |  |  |
Long-term debt, including capitalized lease obligations | 0.0 |  | 0.0 |  |  |  |
Deferred income taxes | 0.0 |  | 0.0 |  |  |  |
Asset retirement obligations | 0.0 |  | 0.0 |  |  |  |
Deferred credits and other liabilities | 0.0 |  | 0.0 |  |  |  |
Total liabilities | 0.0 |  | 0.0 |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Preferred Stock | 0.0 |  | 0.0 |  |  |  |
Common Stock | (0.1) |  | (0.1) |  |  |  |
Treasury Stock | 0.0 |  | 0.0 |  |  |  |
Additional paid in capital (APIC) | (1,368.4) |  | (1,368.4) |  |  |  |
Retained earnings | (1,625.1) |  | (1,367.2) |  |  |  |
Accumulated other comprehensive income (loss) (AOCI) | 0.0 |  | 0.0 |  |  |  |
Total stockholders' equity | (2,993.6) |  | (2,735.7) |  |  |  |
Total liabilities and stockholders' equity | (2,993.6) |  | (2,735.7) |  |  |  |
Parent Company | Reportable Legal Entities |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |
Cash and cash equivalents | 0.0 |  | 0.0 |  |  |  |
Accounts receivable—trade, less allowance for doubtful accounts | 0.0 |  | 0.0 |  |  |  |
Inventories, at lower of cost or market | 0.0 |  | 0.0 |  |  |  |
Prepaid expenses and other current assets | 0.0 |  | 0.0 |  |  |  |
Total current assets | 0.0 |  | 0.0 |  |  |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization | 0.0 |  | 0.0 |  |  |  |
Investments in subsidiaries | 2,850.0 |  | 2,591.8 |  |  |  |
Other assets | 0.0 |  | 0.0 |  |  |  |
Total assets | 2,850.0 |  | 2,591.8 |  |  |  |
Current liabilities |  |  |  |  |  |  |
Current maturities of long-term debt | 0.0 |  | 0.0 |  |  |  |
Inter-company accounts payable | 141.0 |  | (0.1) |  |  |  |
Trade accounts payable and accrued liabilities | 0.0 |  | 0.0 |  |  |  |
Income taxes payable | 0.0 |  |  |  |  |  |
Total current liabilities | 141.0 |  | (0.1) |  |  |  |
Long-term debt, including capitalized lease obligations | 0.0 |  | 0.0 |  |  |  |
Deferred income taxes | 0.0 |  | 0.0 |  |  |  |
Asset retirement obligations | 0.0 |  | 0.0 |  |  |  |
Deferred credits and other liabilities | 0.0 |  | 0.0 |  |  |  |
Total liabilities | 141.0 |  | (0.1) |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Preferred Stock | 0.0 |  | 0.0 |  |  |  |
Common Stock | 0.5 |  | 0.5 |  |  |  |
Treasury Stock | (1,235.2) |  | (1,099.8) |  |  |  |
Additional paid in capital (APIC) | 1,183.1 |  | 1,188.8 |  |  |  |
Retained earnings | 2,760.6 |  | 2,502.4 |  |  |  |
Accumulated other comprehensive income (loss) (AOCI) | 0.0 |  | 0.0 |  |  |  |
Total stockholders' equity | 2,709.0 |  | 2,591.9 |  |  |  |
Total liabilities and stockholders' equity | 2,850.0 |  | 2,591.8 |  |  |  |
Issuer | Reportable Legal Entities |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |
Cash and cash equivalents | 403.0 |  | 279.4 |  |  |  |
Accounts receivable—trade, less allowance for doubtful accounts | 161.1 |  | 173.0 |  |  |  |
Inventories, at lower of cost or market | 257.7 |  | 227.6 |  |  |  |
Prepaid expenses and other current assets | 17.7 |  | 29.6 |  |  |  |
Total current assets | 839.5 |  | 709.6 |  |  |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization | 1,823.3 |  | 1,799.1 |  |  |  |
Investments in subsidiaries | 143.6 |  | 143.9 |  |  |  |
Other assets | 186.1 |  | 169.1 |  |  |  |
Total assets | 2,992.5 |  | 2,821.7 |  |  |  |
Current liabilities |  |  |  |  |  |  |
Current maturities of long-term debt | 51.2 |  | 38.8 |  |  |  |
Inter-company accounts payable | 52.4 |  | 196.1 |  |  |  |
Trade accounts payable and accrued liabilities | 461.2 |  | 466.2 |  |  |  |
Income taxes payable | 41.2 |  |  |  |  |  |
Total current liabilities | 606.0 |  | 701.1 |  |  |  |
Long-term debt, including capitalized lease obligations | 975.3 |  | 999.3 |  |  |  |
Deferred income taxes | 225.2 |  | 216.7 |  |  |  |
Asset retirement obligations | 33.7 |  | 32.8 |  |  |  |
Deferred credits and other liabilities | 154.8 |  | 130.4 |  |  |  |
Total liabilities | 1,995.0 |  | 2,080.3 |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Preferred Stock | 0.0 |  | 0.0 |  |  |  |
Common Stock | 0.0 |  | 0.0 |  |  |  |
Treasury Stock | 0.0 |  | 0.0 |  |  |  |
Additional paid in capital (APIC) | 578.8 |  | 578.8 |  |  |  |
Retained earnings | 421.2 |  | 161.9 |  |  |  |
Accumulated other comprehensive income (loss) (AOCI) | (2.5) |  | 0.7 |  |  |  |
Total stockholders' equity | 997.5 |  | 741.4 |  |  |  |
Total liabilities and stockholders' equity | 2,992.5 |  | 2,821.7 |  |  |  |
Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |
Cash and cash equivalents | 0.6 |  | 0.9 |  |  |  |
Accounts receivable—trade, less allowance for doubtful accounts | 0.2 |  | (0.1) |  |  |  |
Inventories, at lower of cost or market | 0.0 |  | 0.0 |  |  |  |
Prepaid expenses and other current assets | 0.0 |  | 0.4 |  |  |  |
Total current assets | 0.8 |  | 1.2 |  |  |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization | 11.0 |  | 8.2 |  |  |  |
Investments in subsidiaries | 0.0 |  | 0.0 |  |  |  |
Other assets | 0.0 |  | 0.0 |  |  |  |
Total assets | 11.8 |  | 9.4 |  |  |  |
Current liabilities |  |  |  |  |  |  |
Current maturities of long-term debt | 0.0 |  | 0.0 |  |  |  |
Inter-company accounts payable | (39.1) |  | (41.7) |  |  |  |
Trade accounts payable and accrued liabilities | 0.5 |  | 0.0 |  |  |  |
Income taxes payable | (0.4) |  |  |  |  |  |
Total current liabilities | (39.0) |  | (41.7) |  |  |  |
Long-term debt, including capitalized lease obligations | 0.0 |  | 0.0 |  |  |  |
Deferred income taxes | 0.0 |  | 0.0 |  |  |  |
Asset retirement obligations | 0.0 |  | 0.0 |  |  |  |
Deferred credits and other liabilities | 0.0 |  | 0.0 |  |  |  |
Total liabilities | (39.0) |  | (41.7) |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Preferred Stock | 0.0 |  | 0.0 |  |  |  |
Common Stock | 0.1 |  | 0.1 |  |  |  |
Treasury Stock | 0.0 |  | 0.0 |  |  |  |
Additional paid in capital (APIC) | 52.0 |  | 52.0 |  |  |  |
Retained earnings | (1.3) |  | (1.0) |  |  |  |
Accumulated other comprehensive income (loss) (AOCI) | 0.0 |  | 0.0 |  |  |  |
Total stockholders' equity | 50.8 |  | 51.1 |  |  |  |
Total liabilities and stockholders' equity | 11.8 |  | 9.4 |  |  |  |
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |
Cash and cash equivalents | 0.0 |  | 0.0 |  |  |  |
Accounts receivable—trade, less allowance for doubtful accounts | 0.0 |  | 0.0 |  |  |  |
Inventories, at lower of cost or market | 0.0 |  | 0.0 |  |  |  |
Prepaid expenses and other current assets | 0.0 |  | 0.0 |  |  |  |
Total current assets | 0.0 |  | 0.0 |  |  |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization | 0.0 |  | 0.0 |  |  |  |
Investments in subsidiaries | 0.0 |  | 0.0 |  |  |  |
Other assets | 0.0 |  | 0.0 |  |  |  |
Total assets | 0.0 |  | 0.0 |  |  |  |
Current liabilities |  |  |  |  |  |  |
Current maturities of long-term debt | 0.0 |  | 0.0 |  |  |  |
Inter-company accounts payable | (154.3) |  | (154.3) |  |  |  |
Trade accounts payable and accrued liabilities | 0.0 |  | 0.0 |  |  |  |
Income taxes payable | 0.0 |  |  |  |  |  |
Total current liabilities | (154.3) |  | (154.3) |  |  |  |
Long-term debt, including capitalized lease obligations | 0.0 |  | 0.0 |  |  |  |
Deferred income taxes | 0.0 |  | 0.0 |  |  |  |
Asset retirement obligations | 0.0 |  | 0.0 |  |  |  |
Deferred credits and other liabilities | 0.0 |  | 0.0 |  |  |  |
Total liabilities | (154.3) |  | (154.3) |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Preferred Stock | 0.0 |  | 0.0 |  |  |  |
Common Stock | 0.0 |  | 0.0 |  |  |  |
Treasury Stock | 0.0 |  | 0.0 |  |  |  |
Additional paid in capital (APIC) | 87.5 |  | 87.5 |  |  |  |
Retained earnings | 66.8 |  | 66.8 |  |  |  |
Accumulated other comprehensive income (loss) (AOCI) | 0.0 |  | 0.0 |  |  |  |
Total stockholders' equity | 154.3 |  | 154.3 |  |  |  |
Total liabilities and stockholders' equity | $ 0.0 |  | $ 0.0 |  |  |  |

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