Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Allowance for doubtful accounts	$ 89,606,000	$ 79,059,000	$ 80,757,000	$ 80,013,000
Contract asset, allowance for doubtful accounts	4,915,000	3,404,000	$ 4,808,000	$ 4,993,000
Accumulated depreciation on property, plant and equipment	1,219,158	1,142,667
Other assets, allowance for credit loss	$ 66,152,000	$ 66,081,000
Shareholders’ equity:
Common shares, par value (in dollars per share)	$ 1.25
Common shares, shares authorized (in shares)	305,000
Common shares, shares issued (in shares)	176,793	176,793
Treasury shares (in shares)	48,817	45,688