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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial instruments |  |
Preferred stock of subsidiary | $ 30.4 | $ 30.4
Carrying amount |  |
Financial instruments |  |
Preferred stock of subsidiary | 30.4 | 30.4
Long-term debt, including current portion | 13,041.8 | 12,450.5
Finance lease obligations | 62.9 | 63.4
Fair value |  |
Financial instruments |  |
Preferred stock of subsidiary | 29.9 | 32.3
Long-term debt, including current portion | $ 14,139.0 | $ 14,343.2

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