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Lessor accounting (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Leases [Abstract]        
Operating Lease, Lease Income $ 11.1 $ 12.0 $ 23.3 $ 23.4
Lessor, Operating Lease, Payments to be Received, Next Twelve Months $ 7.9   $ 7.9