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10-Q Contingencies - Guarantees (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Other Commitments [Line Items]    
Guarantor obligations, maximum exposure, undiscounted $ 11,500,000 $ 11,500,000
Amount outstanding under guarantees that is reflected on balance sheet 0 0
Letters of credit set to expire - 2023 4,500,000 8,600,000
Letters of credit set to expire - 2024 436,000 489,000
Outstanding letters of credit 0 0
Amount of surety bonds outstanding 905,400,000 664,700,000
Letter of Credit    
Other Commitments [Line Items]    
Letters of credit $ 4,900,000 $ 9,100,000