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Shareholders' Equity - Translation Adjustments (Details) - USD ($)
$ in Millions
5 Months Ended 7 Months Ended 12 Months Ended
Jun. 02, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]          
Foreign currency translation adjustments $ (4.0) $ 1.7 $ 1.7 $ (7.4) $ 21.5