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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Fair value of long-term debt | $ 5,300.0 |  | $ 5,300.0 |  | $ 4,800.0
Carrying value of long-term debt | 5,000.0 |  | 5,000.0 |  | $ 4,400.0
Carrying value of equity investment | 124.9 | $ 133.8 | 124.9 | $ 133.8 |
Unrealized gain on on equity investment | 17.3 | $ 129.9 |  | $ 129.9 |
Unrealized loss on equity investment |  |  | 0.1 |  |
Other Current Assets |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | 18.9 |  | 18.9 |  |
Other Current Liabilities |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | $ 18.9 |  | $ 18.9 |  |
Stock options |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Antidilutive stock options (in shares) | 0.0 | 0.0 | 0.0 | 0.6 |

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