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Pension Benefits - Actuarial Assumptions Pension Expense (Details) - Pension Plans, Defined Benefit [Member] | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 12, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount Rate |  |  | 4.10% | 4.90%
Weighted-average Discount Rate |  |  | 0.00% | 0.00%
Interest Cost Discount Rate |  |  | 0.00% | 0.00%
Rate of Increase in Future Compensation Levels |  |  | 3.31% | 3.05%
Expected Long Term Rate of Return on Plan Assets |  |  | 6.75% | 7.00%
Post-Freeze [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount Rate |  | 3.94% |  |
Weighted-average Discount Rate |  | 4.22% |  |
Interest Cost Discount Rate |  | 3.18% |  |
Rate of Increase in Future Compensation Levels |  | 3.15% |  |
Expected Long Term Rate of Return on Plan Assets |  | 6.25% |  |
Pre-Freeze [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount Rate | 4.47% |  |  |
Weighted-average Discount Rate | 4.78% |  |  |
Interest Cost Discount Rate | 3.69% |  |  |
Rate of Increase in Future Compensation Levels | 3.15% |  |  |
Expected Long Term Rate of Return on Plan Assets | 6.25% |  |  |

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- Definition Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Interest Cost Discount Rate + References No definition available. + Details
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- Definition Defined Benefit Plan, Assumptions Used in Calculating Net Periodic Benefit Cost, Service Cost Discount Rate + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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