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REVENUES - Operating Lease Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating Lease, Lease Income        
Lease billing suspension $ 38.0      
Operating lease revenue $ 65.4 $ 102.7 $ 173.3 $ 203.8