Earnings (Loss) Per Share - Reconciliation of Weighted Average Number of Shares to Compute Basic and Diluted EPS(Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 7 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Feb. 01, 2015 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Numerator: | ||||||||||||
| Earnings (loss) | $ 10.4 | $ (15.0) | $ 3.4 | $ 5.6 | $ (7.4) | $ (6.4) | $ 0.8 | $ 9.7 | $ (24.3) | $ 4.4 | $ (3.4) | |
| Denominator: | ||||||||||||
| Weighted-average shares – basic | 70,010,538 | 77,517,700 | 71,117,962 | |||||||||
| Effect of dilutive securities: | ||||||||||||
| Stock options (in shares) | 0 | 4,344,139 | 0 | |||||||||
| Weighted-average shares – diluted | 70,010,538 | 81,861,839 | 71,117,962 | |||||||||
| Earnings per share: | ||||||||||||
| Basic (in dollars per share) | $ 0.11 | $ (0.20) | $ 0.05 | $ 0.08 | $ (0.10) | $ (0.09) | $ 0.01 | $ 0.14 | $ (0.35) | $ 0.06 | $ (0.05) | |
| Diluted (in dollars per share) | $ 0.11 | $ (0.20) | $ 0.05 | $ 0.08 | $ (0.10) | $ (0.09) | $ 0.01 | $ 0.14 | $ (0.35) | $ 0.05 | $ (0.05) | |
| Predecessor [Member] | ||||||||||||
| Numerator: | ||||||||||||
| Earnings (loss) | $ (5.1) | |||||||||||
| Denominator: | ||||||||||||
| Weighted-average shares – basic | 561,886,602 | |||||||||||
| Effect of dilutive securities: | ||||||||||||
| Stock options (in shares) | 0 | |||||||||||
| Weighted-average shares – diluted | 561,886,602 | |||||||||||
| Earnings per share: | ||||||||||||
| Basic (in dollars per share) | $ (0.01) | |||||||||||
| Diluted (in dollars per share) | $ (0.01) | |||||||||||