Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Condensed Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 9.2	$ 9.1
Common stock stated value per share	$ 20.00	$ 20.00
Authorized	50,000,000	50,000,000
Issued to voting trustees	19,552,807	18,956,496
Issued to shareholders	4,038,784	3,929,845
In treasury, at cost	(467,712)	(53,108)
Outstanding Common Stock	23,123,879	22,833,233