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STOCK-BASED COMPENSATION (Details 1) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Stock-based compensation | $ 4.1 | $ 3.0 | $ 15.0 | $ 14.5
Mark-to-market adjustments | (1.4) | 2.6 | (5.7) | 3.9
Total expense | $ 2.7 | $ 5.6 | $ 9.3 | $ 18.4

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- Definition Adjustment to expense resulting from changes in the market value of underlying common stock in the liabilities associated with employee/director stock options, performance stock awards, restricted stock awards and deferred directors' compensation issued to employees and directors. + References No definition available. + Details
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- Definition Total equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset. + References No definition available. + Details
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