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Income Taxes - Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Income (loss) before income taxes:            
United States $ (101.8)   $ (53.8)   $ (240.9) $ (0.6)
Foreign 7.7   (3.3)   17.6 0.6
Income (loss) before income tax $ (94.1) $ (33.7) $ (57.1) $ (283.6) $ (223.3) $ 0.0