Stock Repurchases (Details) - Class A Common Shares - USD ($) $ in Millions	230 Months Ended
	Oct. 31, 2021	Aug. 19, 2002
Equity, Class of Treasury Stock [Line Items]
Common stock shares repurchased (in shares)	4,588,632
Cost of common stock repurchased	$ 25.6
Shares Stock Repurchase Plan, August 19, 2002
Equity, Class of Treasury Stock [Line Items]
Approved number of shares to be repurchased (in shares)		2,000,000
Common stock shares repurchased (in shares)	1,053,679
Cost of common stock repurchased	$ 6.2