Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Statement of Stockholders' Equity [Abstract]
Common treasury shares (in shares)	41,816,674	43,095,635	41,816,674	43,095,635	41,859,535	42,494,684	43,483,398	45,243,329
Cash dividends declared per common share (in dollars per share)	$ 0	$ 0	$ 0	$ 0