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Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Current, Federal |  |  |  |  |  |  |  |  | $ 6.7 | $ 17.1 | $ 22.4 |
Current, State |  |  |  |  |  |  |  |  | 2.2 | 2.4 | 3.4 |
Total Current |  |  |  |  |  |  |  |  | 8.9 | 19.5 | 25.8 |
Deferred, Federal |  |  |  |  |  |  |  |  | (22.7) | 1.5 | 10.7 |
Deferred, State |  |  |  |  |  |  |  |  | 0.7 | (1.7) | (3.4) |
Foreign |  |  |  |  |  |  |  |  | (1.4) | (1.7) | 3.5 |
Change in valuation allowance |  |  |  |  |  |  |  |  | 0.5 | 3.0 | 2.2 |
Total Deferred |  |  |  |  |  |  |  |  | (22.9) | 1.1 | 13.0 |
Total income tax expense | $ 3.0 | $ 4.5 | $ (26.3) | $ 4.8 | $ 5.8 | $ 3.0 | $ 6.2 | $ 5.6 | $ (14.0) | $ 20.6 | $ 38.8 | $ 54.5

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