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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Possible decrease in tax expense in next 12 months | $ 7.5 |  |  | $ 7.5 |  |
Taxes paid on cash distribution | $ 28.3 |  |  | $ 28.3 |  | $ 22.1
Effective income tax rate | 25.50% | 37.90% |  | 35.80% | (496.30%) |
Increase in income tax expense | $ 6.9 |  |  | $ 916.0 |  |
Impact of changes in US tax legislation | 4.7 |  |  | 20.0 |  |
Increase in income tax expense of federal rate applied to pretax income | 8.2 |  |  | 25.3 |  |
Increase (decrease) in differences in tax filings from provision | 1.4 |  |  | (1.2) |  |
Decrease from reversal of reserves | 5.7 |  |  | 0.5 |  |
Decrease in deferred tax assets valuation allowance, amount | 1.2 |  |  | 3.3 |  |
Income tax benefit from reorganization |  |  | $ 876.1 |  | $ 876.1 |
Adjustment of deferred tax assets and liabilities | $ 4.7 |  |  | $ 20.0 |  |
Impact of changes in US tax legislation, as a percent | 6.00% |  |  | 7.10% |  |

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