Benefit Plans - Estimated future benefit payments (Detail) $ in Millions	Dec. 31, 2019 USD ($)
Pension plans
Defined Benefit Plan Disclosure [Line Items]
2019	$ 6.8
2020	6.8
2021	6.8
2022	7.2
2023	7.2
Thereafter	36.9
Other post-retirement plans
Defined Benefit Plan Disclosure [Line Items]
2019	1.7
2020	1.6
2021	1.5
2022	1.4
2023	1.3
Thereafter	$ 4.9

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.

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- Definition

Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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- Definition

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

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- Definition

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

+ References

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

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

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