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Guarantees (Details 2)
Jun. 30, 2021
USD ($)
Guarantor Obligations [Line Items]  
Guarantor obligations, maximum exposure, undiscounted $ 171,200,000
Fixed maximum amounts guaranteed by year 2021 37,200,000
Fixed maximum amounts guaranteed by year 2022 67,700,000
Fixed maximum amounts guaranteed by year 2023 55,600,000
Fixed maximum amounts guaranteed by year 2024 500,000
Fixed maximum amounts guaranteed by year 2025 500,000
Fixed maximum amounts guaranteed, thereafter 700,000
No scheduled maturity date 9,000,000.0
Amount outstanding under guarantees that is reflected on balance sheet 0
Letters of credit 25,500,000
Letters of credit set to expire - 2021 23,400,000
Letters of credit set to expire - 2022 2,100,000
Outstanding letters of credit 0
Amount of surety bonds outstanding $ 1,100,000,000