Common Stock and Treasury Stock (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) director shares	Jun. 30, 2024 shares	Jun. 30, 2025 USD ($) director Vote shares	Jun. 30, 2024 shares
Common Stock
Number of board of directors | director	7		7
Class A Common Stock
Common Stock
Number of votes per share of common stock | Vote			1
Percentage of directors to be elected			25.00%
Class A Common Stock | Former Shareholder
Common Stock
Conversion of shares			1
Class A Common Stock | Buy-Back Program
Common Stock
Share repurchase program, authorized amount | $	$ 75.8		$ 75.8
Stock repurchase program, remaining authorization amount | $	$ 17.7		$ 17.7
Stock repurchased during period shares	0	0	0	0
Class B Common Stock
Common Stock
Number of votes per share of common stock | Vote			10
Class B Common Stock | Former Shareholder
Common Stock
Common stock, shares issued (in shares)	0		0
Common stock, shares outstanding (in shares)	0		0