Capital Stock and Dividend Restrictions (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 14, 2021	Sep. 12, 2020	Jun. 11, 2019
Class of Stock
Common stock, shares authorized	200,000,000
Stock compensation expense	$ 8.9	$ 7.5	$ 8.0
Aggregate purchase price of shares repurchased and retired	$ 5.4	$ 116.8	$ 2.5
Stock Repurchase Program, Number of Shares Authorized to be Repurchased					5,500,000
Incremental Common Shares Attributable to Dilutive Effect of Accelerated Share Repurchase Agreements	3,000,000
Stock Repurchased and Retired During Period, Shares	128,171	3,578,743	43,560
Sale of Stock Shares Authorized For Future Sale				47,158,390
Class A Common Stock
Class of Stock
Stock Repurchased and Retired During Period, Shares	72,700
Class A Common Stock
Class of Stock
Common stock, shares authorized	100,000,000
Common Stock, Voting Rights, Votes Per Share	$ 1
Common stock, shares, outstanding	41,699,409	40,335,113
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						2,500,000
Class B Common Stock
Class of Stock
Common stock, shares authorized	100,000,000
Common Stock, Voting Rights, Votes Per Share	$ 5
Common stock, shares, outstanding	20,501,047	21,760,686
Director [Member] | Class A Common Stock
Class of Stock
Shares issued to directors during period	19,081
Stock compensation expense	$ 0.9
Board of Directors
Class of Stock
Aggregate value of shares issued to directors		$ 0.6
Board of Directors | Class A Common Stock
Class of Stock
Shares issued to directors during period		19,491