Common Shares, Redeemable Common Shares and Preferred Shares Common shares by class (Details) - shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Shares, Outstanding	39,469,263	40,474,782	41,347,394
Treasury Stock, Shares, Acquired	(3,882,280)	(3,387,128)
Shares sold	1,840,414	1,514,094
Stock subscription offering, employee cash purchases	90,643	47,037
Options exercised	945,704	953,385
Permanent equity [Member]
Class of Stock [Line Items]
Shares, Outstanding	31,732,003	32,360,648	32,848,308
Treasury Stock, Shares, Acquired	(2,811,834)	(2,316,533)
Shares sold	1,146,842	828,451
Stock subscription offering, employee cash purchases	90,643	47,037
Options exercised	945,704	953,385
Temporary equity [Member]
Class of Stock [Line Items]
Shares, Outstanding	7,737,260	8,114,134	8,499,086
Treasury Stock, Shares, Acquired	(1,070,446)	(1,070,595)
Shares sold	693,572	685,643
Stock subscription offering, employee cash purchases	0	0
Options exercised	0	0