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Income Taxes - Income Tax Benefit (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
Current:            
Federal $ (75.8)   $ (1.9)   $ 26.6 $ (24.2)
State (0.6)   3.6   4.9 (0.1)
Foreign 0.2   0.1   0.5 0.2
Total current (76.2)   1.8   32.0 (24.1)
Deferred:            
Federal 39.1   (33.7)   (51.5) 17.8
State (3.4)   5.1   (4.1) 1.7
Foreign (0.5)   0.1   (3.6) 0.4
Change in valuation allowance 0.0   (3.2)   3.5 (0.2)
Total deferred 35.2   (31.7)   (55.7) 19.7
Total income tax benefit $ (41.0) $ (4.8) $ (29.9) $ (59.9) $ (23.7) $ (4.4)