Debt And Credit Agreements (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 375.0	$ 375.0
Long-term Debt	137.0
Available credit under the Credit Agreement	$ 201.0
Secured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Spread Over Secured Overnight Financing Rate Basis Points	16250.00%
Line of credit facility, covenant terms, maximum debt to EBITDA ratio	4.00
Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio	3.00
Credit Facility covenant leverage ratio two times limitation	2.00
Line Of Credit Facility, Covenant Terms, Maximum Aggregate Dividends	$ 75.0
Credit Facility covenant maximum liquidity	$ 50.0