Defined Contribution and Defined Benefit Retirement - Schedule of Defined Benefit Plan Expected Future Payments (Detail) - Defined Benefit Pension Plans $ in Millions	Dec. 31, 2018 USD ($)
Pension Plans Postretirement And Other Employee Benefits [Line Items]
2019	$ 26.7
2020	28.0
2021	28.1
2022	29.4
2023	29.2
Next 5 years	$ 165.8

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

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=108410482&loc=d3e1928-114920

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

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

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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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- Definition

Pension plans postretirement and other employee benefits.

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