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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Possible decrease in tax expense in next 12 months | $ 2.0 |  |  | $ 2.0 |  |
Taxes paid on cash distribution | $ 17.7 |  |  | 17.7 |  | $ 15.9
Income tax benefit from reorganization |  | $ 876.1 |  | $ 876.1 |  |
Effective income tax rate | 40.60% |  | 4.40% | (640.60%) | 10.60% |
Increase (decrease) in income tax expense | $ 26.7 |  |  | $ (843.9) |  |
Increase in income tax expense due to impact of foreign rates | 25.1 |  |  | 36.0 |  |
Increase in changes in unrecognized tax benefits | 10.5 |  |  | 8.3 |  |
Decrease in income tax expense of federal rate applied to pretax income | 4.2 |  |  | 4.0 |  |
Decrease in deferred tax assets valuation allowance, amount | 1.6 |  |  | 2.7 |  |
Amortization of deferred charges | $ 1.2 |  |  | $ 1.7 |  |

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