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Net investment in finance and sales-type leases (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Other Industries [Abstract]        
Sales-type and financing leases, interest income $ 13.6 $ 15.8 $ 27.3 $ 31.3