For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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Amount of cost for defined contribution plan.

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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, long-term rate of return on assets	7.00%	7.00%	7.00%
Defined benefit plan, expected future employer contributions, next fiscal year	$ 1.0
Defined contribution plan, compensation expense	$ 3.6	$ 3.9	$ 3.8
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Securities \| Technology Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk (percentage)	23.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Securities \| Consumer Cyclical Goods Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk (percentage)	16.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Securities \| Financial Services Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk (percentage)	15.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Securities \| Healthcare Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk (percentage)	14.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Securities \| Communication Services Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk (percentage)	11.00%