Income Taxes - Movement in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
7 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2015 |
Feb. 01, 2015 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | ||||
| Balance, beginning of the period | $ 0.0 | $ 1.3 | $ 1.5 | |
| Increases for tax positions taken on acquired entities | 2.4 | 0.0 | 0.0 | |
| Increases for tax positions taken in a previous period | 0.0 | 0.0 | 0.3 | |
| Expiration of statutes of limitation | (0.9) | (0.4) | (0.5) | |
| Balance, end of period | $ 1.5 | $ 0.9 | $ 1.3 | |
| Predecessor [Member] | ||||
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | ||||
| Balance, beginning of the period | $ 2.4 | |||
| Increases for tax positions taken on acquired entities | 0.0 | |||
| Increases for tax positions taken in a previous period | 0.0 | |||
| Expiration of statutes of limitation | 0.0 | |||
| Balance, end of period | $ 2.4 | |||