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Lessor accounting (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating Lease, Lease Income $ 11.8 $ 10.7 $ 36.6 $ 34.0
Lessor, Operating Lease, Payments to be Received, Next Twelve Months $ 8.3   $ 8.3