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Retirement and Pension Plans - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Defined benefit pension plan contributions	$ 5.1	$ 2.5

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- References

No definition available.

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- Definition

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

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