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Retirement Plans, Postretirement and Postemployment Benefits - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation for defined benefit pension plans | $ 1,000.0 | $ 974.0 |
Combined pension plan and SERP contributions | 82.8 | 88.4 |
Estimated contribution of pension plans | 93.5 |  |
Corporation's matching obligations | $ 20.5 | $ 17.9 | $ 17.6
Defined contribution plan name | 401(a) |  |
Postretirement Health Care Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated contribution of pension plans | $ 1.2 |  |

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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + 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 (g) -URI http://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 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 + Details
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