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Income Taxes - Schedule of Income Tax Benefit (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
 [1]
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]                      
Current, Federal                 $ 26.6 $ (24.2) $ 7.7
Current, State                 4.9 (0.1) 2.2
Current, Foreign                 0.5 0.2  
Total current                 32.0 (24.1) 9.9
Deferred, Federal                 (51.5) 17.8 (22.7)
Deferred, State                 (4.1) 1.7 0.7
Deferred, Foreign                 (3.6) 0.4 (1.4)
Change in valuation allowance                 3.5 (0.2) 0.5
Total deferred                 (55.7) 19.7 (22.9)
Income tax benefit $ (3.0) $ (15.9) $ (3.1) $ (1.7) $ (3.4) $ (3.6) $ 1.0 $ 1.6 $ (23.7) $ (4.4) $ (13.0)
[1] An immaterial prior period goodwill impairment charge of $1.3 million was previously classified as part of selling, general and administrative expense in the condensed consolidated statements of operations was reclassified to conform to the current period presentation and is included as part of the goodwill and intangible asset impairment charges financial statement line item in the current period.