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Defined Benefit Pension Plans - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost, non-service cost	$ (234,000)	$ 904,000	$ (491,000)	$ 1,739,000
U.S.
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			3,000,000	0
U.K. Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			$ 288,000	$ 345,000

X

- Definition

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

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- Definition

Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

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