Equity and Financing Arrangements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Aug. 31, 2023	Mar. 06, 2023
Common Stock [Abstract]
Common stock issued during period under the stock plan	0	0	0	0
Dilutive Shares Calculation [Abstract]
Shares included in diluted earnings per share			21,423
3.75%, 2027 Series, Industrial Revenue Bonds | Nontaxable Municipal Bonds [Member]
Debt Instrument [Line Items]
Face amount						$ 19.3
Interest rate						3.75%
3.09%, due 2023 | Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Long-Term Debt, Gross	$ 30.0		$ 30.0
Debt issuance, 5.91% due 2053 | Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Face amount					$ 30.0
Interest rate					5.91%
Debt Issuance, 5.61% due 2034 | Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Face amount					$ 40.0
Interest rate					5.61%