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STOCKHOLDERS' EQUITY - Incentive Plans (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
	Apr. 06, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Sep. 09, 2016
General and administrative
Stock-based compensation
Compensation expense recorded		$ (2.3)	$ 4.4	$ (8.0)	$ 12.2
2016 Incentive Plan
Stock-based compensation
Incremental reduction to stock-based compensation expense		$ 1.1		$ 9.5
2016 Incentive Plan | Common Stock
Stock-based compensation
Aggregate number of shares available	19.0						10.0
Increase in shares available for issuance	9.0
Number of calculation days for which shares will be available for issuance	20 days
Maximum number of shares that remained reserved for issuance under the Plan		8.0		8.0		4.9

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Reduction of the fair value of the modified award compared to the fair value of the award immediately before the modification.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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