Stock Compensation Plans, Information Regarding Activity in Stock Option Plans (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of Options [Abstract]
Outstanding beginning balance (in shares)	9,694,352	10,435,990	10,024,862
Granted (in shares)	906,500	935,099	1,045,400
Exercised (in shares)	(946,646)	(1,294,606)	(217,498)
Forfeited (in shares)	(404,664)	(303,908)	(416,774)
Expired (in shares)	(1,139,816)	(78,223)
Outstanding ending balance (in shares)	8,109,726	9,694,352	10,435,990
Number of options exercisable (in shares)	6,297,849	7,786,934	8,449,389
Weighted Average Exercise Price [Abstract]
Outstanding beginning balance (in dollars per share)	$ 15.24	$ 15.09	$ 15.09
Granted (in dollars per share)	14.39	14.45	14.97
Exercised (in dollars per share)	13.00	13.52	13.23
Forfeited (in dollars per share)	15.69	15.23	15.88
Expired (in dollars per share)	16.40	13.64
Outstanding ending balance (in dollars per share)	15.22	15.24	15.09
Exercisable (in dollars per share)	$ 15.43	$ 15.42	$ 15.13