Goodwill and Identifiable Intangible Assets - Schedule of Goodwill (Details) - USD ($)
$ in Millions |
7 Months Ended |
12 Months Ended |
Jun. 30, 2015 |
Feb. 01, 2015 |
Jun. 30, 2017 |
Jun. 30, 2016 |
| Goodwill [Roll Forward] |
|
|
|
|
| Beginning Balance |
$ 0.0
|
|
$ 781.5
|
$ 662.5
|
| Acquisitions |
662.5
|
|
0.0
|
119.7
|
| Measurement period adjustments |
|
|
|
(0.7)
|
| Impairment charges |
0.0
|
|
0.0
|
0.0
|
| Ending Balance |
662.5
|
|
781.5
|
781.5
|
| PNS [Member] |
|
|
|
|
| Goodwill [Roll Forward] |
|
|
|
|
| Beginning Balance |
0.0
|
|
781.5
|
662.5
|
| Acquisitions |
662.5
|
|
0.0
|
119.7
|
| Measurement period adjustments |
|
|
|
(0.7)
|
| Impairment charges |
0.0
|
|
0.0
|
0.0
|
| Ending Balance |
662.5
|
|
781.5
|
781.5
|
| Atlantix [Member] |
|
|
|
|
| Goodwill [Roll Forward] |
|
|
|
|
| Beginning Balance |
0.0
|
|
0.0
|
0.0
|
| Acquisitions |
0.0
|
|
0.0
|
0.0
|
| Measurement period adjustments |
|
|
|
0.0
|
| Impairment charges |
0.0
|
|
0.0
|
0.0
|
| Ending Balance |
$ 0.0
|
|
$ 0.0
|
$ 0.0
|
| Predecessor [Member] |
|
|
|
|
| Goodwill [Roll Forward] |
|
|
|
|
| Beginning Balance |
|
$ 556.9
|
|
|
| Acquisitions |
|
0.0
|
|
|
| Impairment charges |
|
0.0
|
|
|
| Ending Balance |
|
556.9
|
|
|
| Predecessor [Member] | PNS [Member] |
|
|
|
|
| Goodwill [Roll Forward] |
|
|
|
|
| Beginning Balance |
|
544.2
|
|
|
| Acquisitions |
|
0.0
|
|
|
| Impairment charges |
|
0.0
|
|
|
| Ending Balance |
|
544.2
|
|
|
| Predecessor [Member] | Atlantix [Member] |
|
|
|
|
| Goodwill [Roll Forward] |
|
|
|
|
| Beginning Balance |
|
12.7
|
|
|
| Acquisitions |
|
0.0
|
|
|
| Impairment charges |
|
0.0
|
|
|
| Ending Balance |
|
$ 12.7
|
|
|