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Current Expected Credit Losses - Schedule of Weighted-average Remaining Lease Term and Weighted-average Interest Rate (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Weighted-average remaining lease term (in years)    
Sales-type lease arrangements 9 years 8 years 3 months 18 days
Weighted-average interest rate    
Sales-type lease arrangements 6.55% 6.56%
Financed sales receivables 8.75% 8.92%