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Accounts Payable and Accrued Liabilities (Notes) | 12 Months Ended
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Dec. 31, 2016
Accounts Payable and Accrued Liabilities [Abstract] |
Accounts Payable and Accrued Liabilities [Text Block] | ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
| December 31,
($ millions) | 2016 |  | 2015
Trade payables | $ | 11.5 |  |  | $ | 5.4 |
Compensation and employee benefits | 12.5 |  |  | 19.2 |
Postretirement health and life benefit obligations - current | 13.8 |  |  | 5.3 |
Severance | 3.4 |  |  | 8.7 |
Other accrued liabilities | 5.2 |  |  | 6.2 |
| $ | 46.4 |  |  | $ | 44.8 |

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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a),20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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