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Revenue Recognition (Lease Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]        
Lease revenue $ 4.7 $ 3.5 $ 9.5 $ 7.7