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Pension and Other Postretirement Employee Benefits (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Feb. 29, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Funding of pension and other postretirement benefit plans |  | $ 2,839,000 | $ 3,135,000 |  |
Pension Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Change in monthly retirement benefit amount |  | 0 |  |  |
Non-cash pretax settlement charge | $ 43,000,000.0 |  |  |  |
Reduction in funded status of qualified pension plans | $ (26,200,000) |  |  |  |
Qualified Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred contribution |  | $ 4,400,000 |  |  |
Qualified Plan [Member] | Pension Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Discount rate used to measure projected benefit obligations for qualified pension plans |  | 2.95% |  |  | 3.40%
Qualified Plan [Member] | Pension Plans [Member] | Funded with Plan Assets [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Transfer of outstanding pension benefit obligation related to qualified pension plans to insurance company |  |  |  | $ 101,100,000 |
Reduction in funded status of qualified pension plans |  | $ 26,200,000 |  |  |

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- Definition Pension and other postretirement benefit deferred contributions. + References No definition available. + Details
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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://www.xbrl.org/2003/role/disclosureRef -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 Amount of (increase) decrease to benefit obligation of defined benefit plan from remeasurement due to settlement. Excludes decrease to benefit obligation for settlement payment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
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