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Lessor accounting (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Operating Lease, Lease Income $ 12.8 $ 11.2 $ 24.8 $ 23.3
Lessor, Operating Lease, Payments to be Received, Next Twelve Months $ 9.8   $ 9.8