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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 29, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Contributions by employer |  |  | $ 3,600,000 | $ 3,900,000 | $ 3,700,000 |
Accumulated benefit obligation |  |  | 390,300,000 | 458,100,000 |  |
Funding of pension and other postretirement benefit plans |  |  | 10,004,000 | 5,678,000 | $ 57,580,000 |
Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Investments in Level 3 |  |  | 0 | $ 0 |  |
Qualified Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  |  | $ 1,800,000 |  |  |
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Decrease in accumulated postretirement benefit obligations |  |  |  |  |  | $ 76,700,000
Management Deferred Compensation Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Annual incentive plan, employee permitted minimum defer percentage |  |  | 50.00% |  |  |
Annual incentive plan, employee permitted maximum defer percentage |  |  | 100.00% |  |  |
Management Deferred Compensation Plan [Member] | Minimum [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Basic salary defer percentage |  |  | 50.00% |  |  |
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 |  |  |  |  |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  |  | $ 21,923,000 |  |  |
Pension Plans [Member] | Qualified Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Discount rate used to measure projected benefit obligations for qualified pension plans |  |  | 2.95% | 3.40% |  |
Pension Plans [Member] | Qualified Plan [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 |  |  |  |
Pension Plans [Member] | Nonqualified Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  |  | $ 2,400,000 |  |  |
Other Postretirement Benefit Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  |  | 4,211,000 |  |  |
Other Postretirement Benefit Plans [Member] | Nonqualified Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  |  | $ 4,200,000 |  |  |
Non Deltic Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Assumption Health Care Cost Trend Rate for Next Fiscal Year |  |  | 4.50% |  |  |
Non Deltic Plan [Member] | Minimum [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Health care cost trend rate assumed for next fiscal year |  |  | 6.36% |  |  |
Non Deltic Plan [Member] | Maximum [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Health care cost trend rate assumed for next fiscal year |  |  | 7.05% |  |  |
Deltic Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Health care cost trend rate assumed for next fiscal year |  |  | 6.78% |  |  |
Defined Benefit Plan, Assumption Health Care Cost Trend Rate for Next Fiscal Year |  |  | 4.50% |  |  |

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