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Leases - Cost of Equipment Leased (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
Equipment leased to others, cost $ 12.0 $ 5.1
Less: accumulated depreciation 2.0 1.4
Equipment leased to others, net $ 10.0 $ 3.7