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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Fair value of long-term debt | $ 4,700.0 |  | $ 4,800.0
Carrying value of long-term debt | 4,400.0 |  | $ 4,400.0
Carrying value of equity investment | 106.0 |  |
Unrealized gain on on equity investment | 11.9 |  |
Other Current Assets |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Restricted cash and cash equivalents | 17.9 |  |
Other Current Liabilities |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Restricted cash and cash equivalents | $ 17.9 |  |
Stock options |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive stock options (in shares) | 0.0 | 0.0 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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