Benefit Plans - Estimated future benefit payments (Detail) $ in Millions	Dec. 31, 2020 USD ($)
Pension plans
Defined Benefit Plan Disclosure [Line Items]
2021	$ 7.0
2022	7.2
2023	7.4
2024	7.6
2025	7.5
2026-2030	36.0
Other post-retirement plans
Defined Benefit Plan Disclosure [Line Items]
2021	1.5
2022	1.4
2023	1.3
2024	1.2
2025	1.1
2026-2030	$ 4.3

Defined Benefit Plan, Expected Future Benefit Payments after Year Five

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of benefit for defined benefit plan expected to be paid 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 (f)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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- Definition

Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

+ References

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- Definition

Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

+ References

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- Definition

Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

+ References

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- Definition

Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

+ References

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