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Employee Benefits - Postretirement Plan and Summary Information for All Defined Benefit Plans (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2006 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SERPs |  |  |  |
Summary of benefit payments under the Company's various defined benefit plans, which reflect expected future employee service, as appropriate, expected to be paid in the future periods |  |  |  |
2021 |  | $ 0.9 |  |
2022 |  | 12.0 |  |
2023 |  | 0.9 |  |
2024 |  | 0.8 |  |
2025 |  | 0.8 |  |
2026-2030 |  | 3.6 |  |
Defined Benefit Plans |  |  |  |
Summary of benefit payments under the Company's various defined benefit plans, which reflect expected future employee service, as appropriate, expected to be paid in the future periods |  |  |  |
2021 |  | 2.0 |  |
2022 |  | 2.3 |  |
2023 |  | 2.5 |  |
2024 |  | 2.7 |  |
2025 |  | 2.9 |  |
2026-2030 |  | $ 16.7 |  |
Supplemental Bonus Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of the entity to be contributed to the plan as a result of acquisition | 258,006 |  |  |
Share liability to the plan to be settled in cash |  | 53,197 |  |
Cash equivalent of share liability to the plan |  | $ 6.3 |  |
Expense (income) from mark to market adjustment |  | $ (0.2) | $ 3.3 | $ (0.8)

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- Definition For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable after one year (or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6410138&loc=d3e79708-111665 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6410138&loc=d3e79691-111665 + Details
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