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Income Taxes - Income Tax Benefit (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Current:                              
Federal                     $ (75.8)   $ 26.6 $ (24.2) $ 7.7
State                     (0.6)   4.9 (0.1) 2.2
Foreign                     0.2   0.5 0.2 0.0
Total current                     (76.2)   32.0 (24.1) 9.9
Deferred:                              
Federal                     39.1   (51.5) 17.8 (22.7)
State                     (3.4)   (4.1) 1.7 0.7
Foreign                     (0.5)   (3.6) 0.4 (1.4)
Change in valuation allowance                     0.0   3.5 (0.2) 0.5
Total deferred                     35.2   (55.7) 19.7 (22.9)
Total income tax benefit $ (12.5) $ (28.5) $ (3.0) $ (15.9) $ (3.1) $ (1.7) $ (3.4) $ (3.6) $ 1.0 $ 1.6 $ (41.0) $ (4.8) $ (23.7) $ (4.4) $ (13.0)