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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions by employer |  | $ 4,000,000.0 | $ 3,600,000 | $ 3,900,000
Accumulated benefit obligation |  | 374,700,000 | 390,300,000 |
Funding of pension and other postretirement benefit plans |  | 9,044,000 | 10,004,000 | 5,678,000
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 |  | $ 0 |  |
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 |  |  |
Discount rate used to measure projected benefit obligations for qualified pension plans |  | 3.00% | 2.65% |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  | $ 22,574,000 |  |
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 |  |  |
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 |  | $ 2,500,000 |  |
Other Postretirement Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount rate used to measure projected benefit obligations for qualified pension plans |  | 2.95% | 2.60% |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  | $ 2,532,000 |  |
Defined Benefit Plan, Assumption Health Care Cost Trend Rate for Next Fiscal Year |  | 4.00% |  |
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 |  | $ 2,500,000 |  |
Other Postretirement Benefit Plans [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Health care cost trend rate assumed for next fiscal year |  | 6.06% |  |
Other Postretirement Benefit Plans [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Health care cost trend rate assumed for next fiscal year |  | 6.58% |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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