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Retirement Benefit Obligations - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributions to benefit plan	$ 4.7
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Contributions to benefit plan	2.8
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefit payments under SERP Plan	0.5
Expected additional benefit payments for the remainder of 2019	$ 0.2

X

- Definition

Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

+ References

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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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.

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- Definition

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

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