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Employee Benefit Plans - Net Periodic Benefit Cost and General Information (Details) - USD ($) shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net asset (liability) |  |  |
Long-term liabilities | $ (23,200,000) | $ (23,800,000) |
Components of net periodic benefit cost |  |  |
Mandatory minimum employer contributions to pension plans | $ 0 | 0 |
Defined Contribution Plans |  |  |
Maximum company match (as a percent) | 4.00% |  |
Employer contributions for the savings account | $ 20,300,000 | $ 16,900,000 | $ 16,900,000
Maximum percentage of employee compensation match by employer to employee stock ownership plan | 50.00% |  |
Common shares held (in shares) | 0.6 | 0.7 | 0.8
Deferred Compensation - Cash |  |  |
Deferred compensation plan, employer matching contribution (percent) | 4.00% |  |
Deferred compensation arrangement, compensation distribution period | 10 years |  |
Cash |  |  |
Deferred Compensation - Cash |  |  |
Deferred compensation, Rabbi Trust | $ 4,000,000 | $ 5,700,000 |
Short-term Investments |  |  |
Deferred Compensation - Cash |  |  |
Deferred compensation, Rabbi Trust | $ 8,100,000 | $ 8,100,000 |
Defined Benefit Plans |  |  |
Weighted-average assumptions for benefit obligations |  |  |
Discount rate (as a percent) | 5.00% | 2.50% |
Rate of compensation increase (as a percent) | 3.80% | 3.80% |
Weighted-average assumptions for net periodic benefit cost |  |  |
Discount rate (as a percent) | 2.60% | 2.20% | 3.00%
Rate of compensation increase (as a percent) | 3.80% | 3.80% | 3.80%
Expected long-term return on plan assets (as a percent) | 6.60% | 6.60% | 6.60%
Weighted-average cash balance interest crediting rate (as a percent) | 4.00% | 4.00% | 4.00%
Net asset (liability) |  |  |
Long-term assets | $ 0 | $ 500,000 |
Current liabilities | (1,500,000) | (1,500,000) |
Long-term liabilities | (19,600,000) | (19,800,000) |
Net pension liabilities | (21,100,000) | (20,800,000) |
Components of net periodic benefit cost |  |  |
Service cost | 2,300,000 | 3,000,000.0 | $ 3,000,000.0
Interest cost | 3,300,000 | 2,800,000 | 4,500,000
Expected return on plan assets | (9,500,000) | (9,700,000) | (9,800,000)
Amortization of unrecognized net loss | 5,000,000.0 | 6,200,000 | 5,100,000
Amortization of unrecognized prior service credit | 0 | 100,000 | 200,000
Settlement expense | 0 | 1,700,000 | 0
Net periodic benefit cost | 1,100,000 | 4,100,000 | $ 3,000,000.0
Company's contribution to pension plan | 3,500,000 | 1,500,000 |
Pension plans | 13,200,000 | 14,300,000 |
Estimated future benefit payments |  |  |
2023 | 16,000,000.0 |  |
2024 | 13,700,000 |  |
2025 | 14,000,000.0 |  |
2026 | 13,500,000 |  |
2027 | 13,000,000.0 |  |
2028-2032 | 55,800,000 |  |
Executive supplemental and director defined benefit pension plans |  |  |
Components of net periodic benefit cost |  |  |
Company's contribution to pension plan | 1,500,000 | $ 1,500,000 |
Discretionary contributions | 2,000,000 |  |
Expected employer contributions in next fiscal year | $ 3,500,000 |  |

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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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 (h)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 + Details
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