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Retirement Plans (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) plan
United Kingdom Subsidiary [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined benefit pension plans	$ 2.3
Anticipated additional contribution	$ 1.8
United States Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Number of plans | plan	3

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Defined Benefit Plan, Number Of Plans

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

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