Supplemental Condensed Consolidating Financial Information - Consolidating Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015 |
Assets | | | | |
Cash and cash equivalents | $ 157.2 | $ 134 | $ 101.8 | $ 123.4 |
Receivables | 62.2 | 60.7 | | |
Receivable from redemption of Brazilian investment | 0 | 20.5 | | |
Inventories | 111.1 | 92.5 | | |
Income tax receivable | 5.7 | 4.6 | | |
Other current assets | 7.8 | 3.8 | | |
Advances to affiliate | 0 | 0 | | |
Total current assets | 344 | 316.1 | | |
Notes receivable from affiliate | 0 | 0 | | |
Properties, plants and equipment, net | 1,523.3 | 1,542.6 | | |
Goodwill | 76.9 | 76.9 | | |
Other intangible assets, net | 176.2 | 179 | | |
Deferred charges and other assets | 5.3 | 6.3 | | |
Investment in subsidiaries | 0 | 0 | | |
Total assets | 2,125.7 | 2,120.9 | | |
Liabilities and Equity | | | | |
Advances from affiliate | 0 | 0 | | |
Accounts payable | 123.6 | 98.6 | | |
Accrued liabilities | 40.9 | 49.8 | | |
Deferred revenue | 5.6 | 2.5 | | |
Current portion of long-term debt and financing obligation | 6.1 | 4.9 | | |
Interest payable | 6.7 | 16.2 | | |
Income taxes payable | 0 | 0 | | |
Total current liabilities | 182.9 | 172 | | |
Long-term debt and financing obligation | 847 | 849.2 | | |
Payable to affiliate | 0 | 0 | | |
Accrual for black lung benefits | 45.8 | 45.4 | | |
Retirement benefit liabilities | 28.3 | 29 | | |
Deferred income taxes | 418.1 | 352.5 | | |
Asset retirement obligations | 13.9 | 13.9 | | |
Other deferred credits and liabilities | 18.5 | 19 | | |
Total liabilities | 1,554.5 | 1,481 | | |
Equity | | | | |
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at March 31, 2017 and December 31, 2016 | 0 | 0 | | |
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 71,796,912 and 71,707,304 shares at March 31, 2017 and December 31, 2016, respectively | 0.7 | 0.7 | | |
Treasury stock, 7,477,657 shares at March 31, 2017 and December 31, 2016, respectively | (140.7) | (140.7) | | |
Additional paid-in capital | 493.6 | 492.1 | | |
Accumulated other comprehensive loss | (18.9) | (19) | | |
Retained deficit | (21.3) | (22) | | |
Total SunCoke Energy, Inc. stockholders’ equity | 313.4 | 311.1 | | |
Noncontrolling interests | 257.8 | 328.8 | | |
Total equity | 571.2 | 639.9 | | |
Total liabilities and equity | $ 2,125.7 | $ 2,120.9 | | |
Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01 | | |
Preferred stock, shares authorized (in shares) | 50,000,000 | 50,000,000 | | |
Preferred stock, shares issued (in shares) | 0 | 0 | | |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 | | |
Common stock, shares authorized (in shares) | 300,000,000 | 300,000,000 | | |
Common stock, shares, issued (in shares) | 71,796,912 | 71,707,304 | | |
Treasury stock, shares (in shares) | 7,477,657 | 7,477,657 | | |
Reportable Legal Entities | Issuer | | | | |
Assets | | | | |
Cash and cash equivalents | $ 0 | $ 0 | 0 | 0 |
Receivables | 0 | 0 | | |
Receivable from redemption of Brazilian investment | | 0 | | |
Inventories | 0 | 0 | | |
Income tax receivable | 0 | 17.8 | | |
Other current assets | 0 | 0.2 | | |
Advances to affiliate | | 0 | | |
Total current assets | 0 | 18 | | |
Notes receivable from affiliate | 0 | 0 | | |
Properties, plants and equipment, net | 0 | 0 | | |
Goodwill | 0 | 0 | | |
Other intangible assets, net | 0 | 0 | | |
Deferred charges and other assets | 0 | 0 | | |
Investment in subsidiaries | 547.1 | 542.7 | | |
Total assets | 547.1 | 560.7 | | |
Liabilities and Equity | | | | |
Advances from affiliate | 166.5 | 184.2 | | |
Accounts payable | 0 | 0 | | |
Accrued liabilities | 0.7 | 1.7 | | |
Deferred revenue | 0 | 0 | | |
Current portion of long-term debt and financing obligation | 0 | 0 | | |
Interest payable | 0.5 | 1.5 | | |
Income taxes payable | 4.2 | 0 | | |
Total current liabilities | 171.9 | 187.4 | | |
Long-term debt and financing obligation | 43.3 | 43.5 | | |
Payable to affiliate | 0 | 0 | | |
Accrual for black lung benefits | 0 | 0 | | |
Retirement benefit liabilities | 0 | 0 | | |
Deferred income taxes | 15.9 | 15.9 | | |
Asset retirement obligations | 0 | 0 | | |
Other deferred credits and liabilities | 2.6 | 2.8 | | |
Total liabilities | 233.7 | 249.6 | | |
Equity | | | | |
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at March 31, 2017 and December 31, 2016 | 0 | 0 | | |
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 71,796,912 and 71,707,304 shares at March 31, 2017 and December 31, 2016, respectively | 0.7 | 0.7 | | |
Treasury stock, 7,477,657 shares at March 31, 2017 and December 31, 2016, respectively | (140.7) | (140.7) | | |
Additional paid-in capital | 493.6 | 492.1 | | |
Accumulated other comprehensive loss | (18.9) | (19) | | |
Retained deficit | (21.3) | (22) | | |
Total SunCoke Energy, Inc. stockholders’ equity | 313.4 | 311.1 | | |
Noncontrolling interests | 0 | 0 | | |
Total equity | 313.4 | 311.1 | | |
Total liabilities and equity | 547.1 | 560.7 | | |
Reportable Legal Entities | Guarantor Subsidiaries | | | | |
Assets | | | | |
Cash and cash equivalents | 87.1 | 59.7 | 61.1 | 70.6 |
Receivables | 14.5 | 12.2 | | |
Receivable from redemption of Brazilian investment | | 0 | | |
Inventories | 10.8 | 9 | | |
Income tax receivable | 0 | 0 | | |
Other current assets | 3.9 | 1.8 | | |
Advances to affiliate | 246.6 | 282.2 | | |
Total current assets | 362.9 | 364.9 | | |
Notes receivable from affiliate | 89 | 89 | | |
Properties, plants and equipment, net | 61.3 | 62.8 | | |
Goodwill | 3.4 | 3.4 | | |
Other intangible assets, net | 2.1 | 2.3 | | |
Deferred charges and other assets | 4.2 | 5.1 | | |
Investment in subsidiaries | 723.9 | 688.2 | | |
Total assets | 1,246.8 | 1,215.7 | | |
Liabilities and Equity | | | | |
Advances from affiliate | 0 | 0 | | |
Accounts payable | 16.9 | 13.6 | | |
Accrued liabilities | 13 | 20.5 | | |
Deferred revenue | 0 | 0 | | |
Current portion of long-term debt and financing obligation | 0 | 0 | | |
Interest payable | 0 | 0 | | |
Income taxes payable | 66.4 | 87.5 | | |
Total current liabilities | 96.3 | 121.6 | | |
Long-term debt and financing obligation | 0 | 0 | | |
Payable to affiliate | 300 | 300 | | |
Accrual for black lung benefits | 12.6 | 12.3 | | |
Retirement benefit liabilities | 13.9 | 14.1 | | |
Deferred income taxes | 286.4 | 371 | | |
Asset retirement obligations | 0 | 0 | | |
Other deferred credits and liabilities | 6 | 6.4 | | |
Total liabilities | 715.2 | 825.4 | | |
Equity | | | | |
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at March 31, 2017 and December 31, 2016 | 0 | 0 | | |
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 71,796,912 and 71,707,304 shares at March 31, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Treasury stock, 7,477,657 shares at March 31, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Additional paid-in capital | 175.8 | 42.1 | | |
Accumulated other comprehensive loss | (1.6) | (1.6) | | |
Retained deficit | 357.4 | 349.8 | | |
Total SunCoke Energy, Inc. stockholders’ equity | 531.6 | 390.3 | | |
Noncontrolling interests | 0 | 0 | | |
Total equity | 531.6 | 390.3 | | |
Total liabilities and equity | 1,246.8 | 1,215.7 | | |
Reportable Legal Entities | Non- Guarantor Subsidiaries | | | | |
Assets | | | | |
Cash and cash equivalents | 70.1 | 74.3 | 40.7 | 52.8 |
Receivables | 47.7 | 48.5 | | |
Receivable from redemption of Brazilian investment | | 20.5 | | |
Inventories | 100.3 | 83.5 | | |
Income tax receivable | 76.3 | 74.3 | | |
Other current assets | 3.9 | 1.8 | | |
Advances to affiliate | 0 | 0 | | |
Total current assets | 298.3 | 302.9 | | |
Notes receivable from affiliate | 300 | 300 | | |
Properties, plants and equipment, net | 1,462 | 1,479.8 | | |
Goodwill | 73.5 | 73.5 | | |
Other intangible assets, net | 174.1 | 176.7 | | |
Deferred charges and other assets | 1.1 | 1.2 | | |
Investment in subsidiaries | 0 | 0 | | |
Total assets | 2,309 | 2,334.1 | | |
Liabilities and Equity | | | | |
Advances from affiliate | 80.1 | 98 | | |
Accounts payable | 106.7 | 85 | | |
Accrued liabilities | 27.2 | 27.6 | | |
Deferred revenue | 5.6 | 2.5 | | |
Current portion of long-term debt and financing obligation | 6.1 | 4.9 | | |
Interest payable | 6.2 | 14.7 | | |
Income taxes payable | 0 | 0 | | |
Total current liabilities | 231.9 | 232.7 | | |
Long-term debt and financing obligation | 803.7 | 805.7 | | |
Payable to affiliate | 89 | 89 | | |
Accrual for black lung benefits | 33.2 | 33.1 | | |
Retirement benefit liabilities | 14.4 | 14.9 | | |
Deferred income taxes | 115.8 | (34.4) | | |
Asset retirement obligations | 13.9 | 13.9 | | |
Other deferred credits and liabilities | 9.9 | 9.8 | | |
Total liabilities | 1,311.8 | 1,164.7 | | |
Equity | | | | |
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at March 31, 2017 and December 31, 2016 | 0 | 0 | | |
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 71,796,912 and 71,707,304 shares at March 31, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Treasury stock, 7,477,657 shares at March 31, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Additional paid-in capital | 656.6 | 672.2 | | |
Accumulated other comprehensive loss | (17.2) | (17.4) | | |
Retained deficit | 100 | 185.8 | | |
Total SunCoke Energy, Inc. stockholders’ equity | 739.4 | 840.6 | | |
Noncontrolling interests | 257.8 | 328.8 | | |
Total equity | 997.2 | 1,169.4 | | |
Total liabilities and equity | 2,309 | 2,334.1 | | |
Combining and Consolidating Adjustments | | | | |
Assets | | | | |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0 |
Receivables | 0 | 0 | | |
Receivable from redemption of Brazilian investment | | 0 | | |
Inventories | 0 | 0 | | |
Income tax receivable | (70.6) | (87.5) | | |
Other current assets | 0 | 0 | | |
Advances to affiliate | (246.6) | (282.2) | | |
Total current assets | (317.2) | (369.7) | | |
Notes receivable from affiliate | (389) | (389) | | |
Properties, plants and equipment, net | 0 | 0 | | |
Goodwill | 0 | 0 | | |
Other intangible assets, net | 0 | 0 | | |
Deferred charges and other assets | 0 | 0 | | |
Investment in subsidiaries | (1,271) | (1,230.9) | | |
Total assets | (1,977.2) | (1,989.6) | | |
Liabilities and Equity | | | | |
Advances from affiliate | (246.6) | (282.2) | | |
Accounts payable | 0 | 0 | | |
Accrued liabilities | 0 | 0 | | |
Deferred revenue | 0 | 0 | | |
Current portion of long-term debt and financing obligation | 0 | 0 | | |
Interest payable | 0 | 0 | | |
Income taxes payable | (70.6) | (87.5) | | |
Total current liabilities | (317.2) | (369.7) | | |
Long-term debt and financing obligation | 0 | 0 | | |
Payable to affiliate | (389) | (389) | | |
Accrual for black lung benefits | 0 | 0 | | |
Retirement benefit liabilities | 0 | 0 | | |
Deferred income taxes | 0 | 0 | | |
Asset retirement obligations | 0 | 0 | | |
Other deferred credits and liabilities | 0 | 0 | | |
Total liabilities | (706.2) | (758.7) | | |
Equity | | | | |
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at March 31, 2017 and December 31, 2016 | 0 | 0 | | |
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 71,796,912 and 71,707,304 shares at March 31, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Treasury stock, 7,477,657 shares at March 31, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Additional paid-in capital | (832.4) | (714.3) | | |
Accumulated other comprehensive loss | 18.8 | 19 | | |
Retained deficit | (457.4) | (535.6) | | |
Total SunCoke Energy, Inc. stockholders’ equity | (1,271) | (1,230.9) | | |
Noncontrolling interests | 0 | 0 | | |
Total equity | (1,271) | (1,230.9) | | |
Total liabilities and equity | $ (1,977.2) | $ (1,989.6) | | |