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SHARE-BASED COMPENSATION- Summary of Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |
Total share-based compensation | $ 13.2 | $ 11.2 | $ 11.3
Stock appreciation rights |  |  |
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |
Total share-based compensation | 5.9 | 5.2 | 4.4
Performance shares |  |  |
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |
Total share-based compensation | 0.2 | 0.2 | 0.2
Restricted stock units |  |  |
Share-Based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |
Total share-based compensation | $ 7.1 | $ 5.8 | $ 6.7

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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