Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions |
7 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2015 |
Feb. 01, 2015 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Current: | ||||
| Federal | $ (0.2) | $ 16.8 | $ 18.4 | |
| State | 0.6 | 3.6 | 5.0 | |
| Deferred: | ||||
| Federal | (11.4) | (16.0) | (17.4) | |
| State | (1.6) | (1.8) | (2.2) | |
| Total income tax expense (benefit) | $ (12.6) | $ 2.6 | $ 3.8 | |
| Predecessor [Member] | ||||
| Current: | ||||
| Federal | $ (1.7) | |||
| State | 1.4 | |||
| Deferred: | ||||
| Federal | 4.4 | |||
| State | (0.9) | |||
| Total income tax expense (benefit) | $ 3.2 | |||