Employee Benefit Plans - Schedule of Defined Benefit Plan Expected Future Payments (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Defined Benefit Pension Plans
Pension Plans Postretirement And Other Employee Benefits [Line Items]
2018	$ 25.9
2019	26.5
2020	27.7
2021	27.8
2022	29.0
Next 5 years	157.3
OPEB
Pension Plans Postretirement And Other Employee Benefits [Line Items]
2018	1.0
2019	0.9
2020	0.9
2021	0.8
2022	0.8
Next 5 years	$ 3.4

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82843861&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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Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

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