SHARE-BASED COMPENSATION - Additional Information (Details) $ / shares in Units, $ in Millions	9 Months Ended
Sep. 30, 2019 USD ($) perfconditions $ / shares shares	Sep. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding to officers, directors and key employees (in shares) \| shares	1,500,000
Total number of shares authorized to be issued under Equity Incentive Plan (up to) (in shares) \| shares	1,200,000.0
Share-based compensation	$ 8.7	$ 9.4
Unrecognized compensation expense related to share-based compensation	$ 13.2
Remaining weighted-average period	1 year 12 months
Exercisable stock option shares outstanding (in shares) \| shares	53,000
Exercise price of stock options (in dollars per share) \| $ / shares	$ 32.55
Weighted-average remaining contractual life of options exercisable	1 year 11 months
Range of prices, lower limit (in dollars per share) \| $ / shares	$ 21.12
Range of prices, upper limit (in dollars per share) \| $ / shares	$ 50.47
Stock and stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 4.6	6.2
Award vesting period	4 years
Long-term performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 4.0	$ 3.2
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award contractual term	10 years
2018 and 2019 \| Long-term performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Performance period	2 years
Share-based compensation award, number of performance conditions \| perfconditions	2
2018 and 2019 \| Long-term performance stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	0.00%
2018 and 2019 \| Long-term performance stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	200.00%

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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