Supplemental Condensed Consolidating Financial Information - Consolidating Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Millions | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015 |
Assets | | | | |
Cash and cash equivalents | $ 136.7 | $ 134 | $ 108 | $ 123.4 |
Receivables | 65.3 | 60.7 | | |
Receivable from redemption of Brazilian investment | 0 | 20.5 | | |
Inventories | 116.4 | 92.5 | | |
Income tax receivable | 16.5 | 4.6 | | |
Other current assets | 6.1 | 3.8 | | |
Advances to affiliate | 0 | 0 | | |
Total current assets | 341 | 316.1 | | |
Notes receivable from affiliate | 0 | 0 | | |
Properties, plants and equipment, net | 1,510.9 | 1,542.6 | | |
Goodwill | 76.9 | 76.9 | | |
Other intangible assets, net | 173.5 | 179 | | |
Deferred charges and other assets | 4.5 | 6.3 | | |
Investment in subsidiaries | 0 | 0 | | |
Total assets | 2,106.8 | 2,120.9 | | |
Liabilities and Equity | | | | |
Advances from affiliate | 0 | 0 | | |
Accounts payable | 126.4 | 98.6 | | |
Accrued liabilities | 43.6 | 49.8 | | |
Deferred revenue | 12 | 2.5 | | |
Current portion of long-term debt and financing obligation | 3.7 | 4.9 | | |
Interest payable | 6.6 | 16.2 | | |
Income taxes payable | 0 | 0 | | |
Total current liabilities | 192.3 | 172 | | |
Long-term debt and financing obligation | 870.3 | 849.2 | | |
Payable to affiliate | 0 | 0 | | |
Accrual for black lung benefits | 46 | 45.4 | | |
Retirement benefit liabilities | 27.8 | 29 | | |
Deferred income taxes | 428.7 | 352.5 | | |
Asset retirement obligations | 13.9 | 13.9 | | |
Other deferred credits and liabilities | 20.4 | 19 | | |
Total liabilities | 1,599.4 | 1,481 | | |
Equity | | | | |
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at June 30, 2017 and December 31, 2016 | 0 | 0 | | |
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 71,807,075 and 71,707,304 shares at June 30, 2017 and December 31, 2016, respectively | 0.7 | 0.7 | | |
Treasury stock, 7,477,657 shares at June 30, 2017 and December 31, 2016, respectively | (140.7) | (140.7) | | |
Additional paid-in capital | 489.2 | 492.1 | | |
Accumulated other comprehensive loss | (19.2) | (19) | | |
Retained deficit | (45.5) | (22) | | |
Total SunCoke Energy, Inc. stockholders’ equity | 284.5 | 311.1 | | |
Noncontrolling interests | 222.9 | 328.8 | | |
Total equity | 507.4 | 639.9 | | |
Total liabilities and equity | $ 2,106.8 | $ 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) | 71,807,075 | 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 | 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 | 519.8 | 542.7 | | |
Total assets | 519.8 | 560.7 | | |
Liabilities and Equity | | | | |
Advances from affiliate | 165.3 | 184.2 | | |
Accounts payable | 0 | 0 | | |
Accrued liabilities | 0.8 | 1.7 | | |
Deferred revenue | 0 | 0 | | |
Current portion of long-term debt and financing obligation | 0 | 0 | | |
Interest payable | 1.4 | 1.5 | | |
Income taxes payable | 0.8 | 0 | | |
Total current liabilities | 168.3 | 187.4 | | |
Long-term debt and financing obligation | 42.5 | 43.5 | | |
Payable to affiliate | 0 | 0 | | |
Accrual for black lung benefits | 0 | 0 | | |
Retirement benefit liabilities | 0 | 0 | | |
Deferred income taxes | 21.3 | 15.9 | | |
Asset retirement obligations | 0 | 0 | | |
Other deferred credits and liabilities | 3.2 | 2.8 | | |
Total liabilities | 235.3 | 249.6 | | |
Equity | | | | |
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at June 30, 2017 and December 31, 2016 | 0 | 0 | | |
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 71,807,075 and 71,707,304 shares at June 30, 2017 and December 31, 2016, respectively | 0.7 | 0.7 | | |
Treasury stock, 7,477,657 shares at June 30, 2017 and December 31, 2016, respectively | (140.7) | (140.7) | | |
Additional paid-in capital | 489.2 | 492.1 | | |
Accumulated other comprehensive loss | (19.2) | (19) | | |
Retained deficit | (45.5) | (22) | | |
Total SunCoke Energy, Inc. stockholders’ equity | 284.5 | 311.1 | | |
Noncontrolling interests | 0 | 0 | | |
Total equity | 284.5 | 311.1 | | |
Total liabilities and equity | 519.8 | 560.7 | | |
Reportable Legal Entities | Guarantor Subsidiaries | | | | |
Assets | | | | |
Cash and cash equivalents | 94.5 | 59.7 | 33 | 70.6 |
Receivables | 11.3 | 12.2 | | |
Receivable from redemption of Brazilian investment | | 0 | | |
Inventories | 10.9 | 9 | | |
Income tax receivable | 0 | 0 | | |
Other current assets | 3 | 1.8 | | |
Advances to affiliate | 239.8 | 282.2 | | |
Total current assets | 359.5 | 364.9 | | |
Notes receivable from affiliate | 89 | 89 | | |
Properties, plants and equipment, net | 61.1 | 62.8 | | |
Goodwill | 3.4 | 3.4 | | |
Other intangible assets, net | 2 | 2.3 | | |
Deferred charges and other assets | 3.5 | 5.1 | | |
Investment in subsidiaries | 731.2 | 688.2 | | |
Total assets | 1,249.7 | 1,215.7 | | |
Liabilities and Equity | | | | |
Advances from affiliate | 0 | 0 | | |
Accounts payable | 17 | 13.6 | | |
Accrued liabilities | 15.9 | 20.5 | | |
Deferred revenue | 0 | 0 | | |
Current portion of long-term debt and financing obligation | 0 | 0 | | |
Interest payable | 0 | 0 | | |
Income taxes payable | 65.9 | 87.5 | | |
Total current liabilities | 98.8 | 121.6 | | |
Long-term debt and financing obligation | 0 | 0 | | |
Payable to affiliate | 300 | 300 | | |
Accrual for black lung benefits | 12.7 | 12.3 | | |
Retirement benefit liabilities | 13.6 | 14.1 | | |
Deferred income taxes | 278.3 | 371 | | |
Asset retirement obligations | 0 | 0 | | |
Other deferred credits and liabilities | 6.8 | 6.4 | | |
Total liabilities | 710.2 | 825.4 | | |
Equity | | | | |
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at June 30, 2017 and December 31, 2016 | 0 | 0 | | |
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 71,807,075 and 71,707,304 shares at June 30, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Treasury stock, 7,477,657 shares at June 30, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Additional paid-in capital | 195.4 | 42.1 | | |
Accumulated other comprehensive loss | (1.6) | (1.6) | | |
Retained deficit | 345.7 | 349.8 | | |
Total SunCoke Energy, Inc. stockholders’ equity | 539.5 | 390.3 | | |
Noncontrolling interests | 0 | 0 | | |
Total equity | 539.5 | 390.3 | | |
Total liabilities and equity | 1,249.7 | 1,215.7 | | |
Reportable Legal Entities | Non- Guarantor Subsidiaries | | | | |
Assets | | | | |
Cash and cash equivalents | 42.2 | 74.3 | 75 | 52.8 |
Receivables | 54 | 48.5 | | |
Receivable from redemption of Brazilian investment | | 20.5 | | |
Inventories | 105.5 | 83.5 | | |
Income tax receivable | 83.2 | 74.3 | | |
Other current assets | 3.1 | 1.8 | | |
Advances to affiliate | 0 | 0 | | |
Total current assets | 288 | 302.9 | | |
Notes receivable from affiliate | 300 | 300 | | |
Properties, plants and equipment, net | 1,449.8 | 1,479.8 | | |
Goodwill | 73.5 | 73.5 | | |
Other intangible assets, net | 171.5 | 176.7 | | |
Deferred charges and other assets | 1 | 1.2 | | |
Investment in subsidiaries | 0 | 0 | | |
Total assets | 2,283.8 | 2,334.1 | | |
Liabilities and Equity | | | | |
Advances from affiliate | 74.5 | 98 | | |
Accounts payable | 109.4 | 85 | | |
Accrued liabilities | 26.9 | 27.6 | | |
Deferred revenue | 12 | 2.5 | | |
Current portion of long-term debt and financing obligation | 3.7 | 4.9 | | |
Interest payable | 5.2 | 14.7 | | |
Income taxes payable | 0 | 0 | | |
Total current liabilities | 231.7 | 232.7 | | |
Long-term debt and financing obligation | 827.8 | 805.7 | | |
Payable to affiliate | 89 | 89 | | |
Accrual for black lung benefits | 33.3 | 33.1 | | |
Retirement benefit liabilities | 14.2 | 14.9 | | |
Deferred income taxes | 129.1 | (34.4) | | |
Asset retirement obligations | 13.9 | 13.9 | | |
Other deferred credits and liabilities | 10.4 | 9.8 | | |
Total liabilities | 1,349.4 | 1,164.7 | | |
Equity | | | | |
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at June 30, 2017 and December 31, 2016 | 0 | 0 | | |
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 71,807,075 and 71,707,304 shares at June 30, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Treasury stock, 7,477,657 shares at June 30, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Additional paid-in capital | 654.8 | 672.2 | | |
Accumulated other comprehensive loss | (17.6) | (17.4) | | |
Retained deficit | 74.3 | 185.8 | | |
Total SunCoke Energy, Inc. stockholders’ equity | 711.5 | 840.6 | | |
Noncontrolling interests | 222.9 | 328.8 | | |
Total equity | 934.4 | 1,169.4 | | |
Total liabilities and equity | 2,283.8 | 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 | (66.7) | (87.5) | | |
Other current assets | 0 | 0 | | |
Advances to affiliate | (239.8) | (282.2) | | |
Total current assets | (306.5) | (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 | (1,251) | (1,230.9) | | |
Total assets | (1,946.5) | (1,989.6) | | |
Liabilities and Equity | | | | |
Advances from affiliate | (239.8) | (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 | (66.7) | (87.5) | | |
Total current liabilities | (306.5) | (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 | (695.5) | (758.7) | | |
Equity | | | | |
Preferred stock, $0.01 par value. Authorized 50,000,000 shares; no issued shares at June 30, 2017 and December 31, 2016 | 0 | 0 | | |
Common stock, $0.01 par value. Authorized 300,000,000 shares; issued 71,807,075 and 71,707,304 shares at June 30, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Treasury stock, 7,477,657 shares at June 30, 2017 and December 31, 2016, respectively | 0 | 0 | | |
Additional paid-in capital | (850.2) | (714.3) | | |
Accumulated other comprehensive loss | 19.2 | 19 | | |
Retained deficit | (420) | (535.6) | | |
Total SunCoke Energy, Inc. stockholders’ equity | (1,251) | (1,230.9) | | |
Noncontrolling interests | 0 | 0 | | |
Total equity | (1,251) | (1,230.9) | | |
Total liabilities and equity | $ (1,946.5) | $ (1,989.6) | | |