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Retirement Plans (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) plan
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Number of plans | plan	3
United Kingdom Subsidiary [Member] | UK Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions to defined benefit pension plans	$ 3.6
Anticipated additional contribution	$ 1.3

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