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Revenue - Sales-type and Operating Lease Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Sales-type lease revenue $ 154.4 $ 81.6 $ 69.8
Operating lease revenue $ 176.7 $ 106.9 $ 51.4