Stockholders' Equity (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock
Shares reserved for issuance under stock plans, dividend reinvestment program and conversion of Preferred and Preference Stock	36,722,032
Common Stock Outstanding
Stock
Shares outstanding (shares)	171,975,188	170,448,943	187,675,082
Repurchases of common stock (shares)			(18,595,315)
Issuance of common stock (shares)	2,756,207	1,526,245	1,276,797
Conversions to common stock (shares)			92,379
Shares outstanding (shares)	174,731,395	171,975,188	170,448,943
Treasury Stock
Stock
Shares outstanding (shares)	151,362,724	152,888,969	135,662,830
Repurchases of common stock (shares)			18,595,315
Issuance of common stock (shares)	(2,756,207)	(1,526,245)	(1,276,797)
Conversions to common stock (shares)			(92,379)
Shares outstanding (shares)	148,606,517	151,362,724	152,888,969