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Employee Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Employer contributions	$ 0.7	$ 1.6	$ 0.9
Estimated future contributions	0.4
Defined contribution plan expense	$ 10.2	$ 11.8	$ 12.4

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

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