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Income Taxes - Loss Before Income Taxes (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2020
Income (loss) before income taxes:        
United States $ (101.8) $ (141.3) $ (53.8) $ (240.9)
Foreign 7.7 0.7 (3.3) 17.6
Loss before income tax $ (94.1) $ (140.6) $ (57.1) $ (223.3)