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Employee Benefit Plans - Schedule of Weighted-Average Assumptions Used (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Benefit Cost for Current Plan Year |  |  | 6.75% | 6.75%
Benefit Cost for Subsequent Plan Year | 6.75% |  | 6.75% | 6.75%
Discount Rates: |  |  |  |
Service Cost for Plan Year |  |  | 4.40% | 3.74%
Interest Cost for Plan Year |  |  | 3.87% | 3.15%
Benefit Obligation at End of Plan Year | 4.24% |  | 3.13% | 4.24%
Salary Scale Inflation |  |  | 4.60% | 4.60%
Post-retirement Benefits |  |  |  |
Discount Rates: |  |  |  |
Service Cost for Plan Year | 4.14% | 3.68% | 4.14% | 4.14%
Interest Cost for Plan Year | 3.45% | 2.79% | 3.51% | 3.45%
Benefit Obligation at End of Plan Year | 3.98% |  | 2.87% | 3.98%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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