EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Earnings Per Share [Abstract] | ||||
| Net income (loss) | $ 52.7 | $ 17.5 | $ 60.2 | $ (21.4) |
| Basic shares (in shares) | 166.3 | 165.2 | 166.0 | 165.2 |
| Basic net income (loss) per share (in dollars per share) | $ 0.32 | $ 0.11 | $ 0.36 | $ (0.13) |
| Earnings Per Share, Diluted [Abstract] | ||||
| Basic shares (in shares) | 166.3 | 165.2 | 166.0 | 165.2 |
| Stock-based compensation (in shares) | 2.2 | 1.3 | 2.2 | 0.0 |
| Diluted shares (in shares) | 168.5 | 166.5 | 168.2 | 165.2 |
| Diluted net income (loss) per share (in dollars per share) | $ 0.31 | $ 0.11 | $ 0.36 | $ (0.13) |
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1.6 | 1.9 | 1.6 | 6.9 |