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Revenue - Contract Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Deferred revenue $ 190.2 $ 160.9 $ 170.5
Deferred revenue - noncurrent 37.9 41.3 $ 36.5
Other contract liabilities - current $ 36.0 $ 39.8