Guarantees (Details 4)	Dec. 31, 2021 USD ($)
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 134,800,000
Fixed maximum amounts guaranteed by year 2022	28,600,000
Fixed maximum amounts guaranteed by year 2023	45,200,000
Fixed maximum amounts guaranteed by year 2024	50,200,000
Fixed maximum amounts guaranteed by year 2025	800,000
Fixed maximum amounts guaranteed by year 2026	800,000
Fixed maximum amounts guaranteed, thereafter	200,000
No scheduled maturity date	9,000,000
Amount outstanding under guarantees that is reflected on balance sheet	0
Letters of credit	25,700,000
Letters of credit set to expire - 2022	25,200,000
Letters of credit set to expire - 2023	500,000
Outstanding letters of credit	0
Amount of surety bonds outstanding	$ 934,400,000