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Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
 [1]
Mar. 31, 2018
 [1]
Dec. 31, 2017
 [1]
Sep. 30, 2017
 [1]
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]                      
Current, Federal                 $ (24.2) $ 7.7 $ 15.5
Current, State                 (0.1) 2.2 2.4
Current, Foreign                 0.2    
Total Current                 (24.1) 9.9 17.9
Deferred, Federal                 17.8 (22.7) 1.5
Deferred, State                 1.7 0.7 (1.7)
Deferred, Foreign                 0.4 (1.4) (1.7)
Change in valuation allowance                 (0.2) 0.5 3.0
Total Deferred                 19.7 (22.9) 1.1
Total income tax expense (benefit) $ (3.4) $ (3.6) $ 1.0 $ 1.6 $ 3.5 $ 4.3 $ (25.3) $ 4.5 $ (4.4) $ (13.0) [1] $ 19.0 [1]
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.