FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
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	18,445.2	16,631.1
Finance lease obligations	267.7	145.9
Fair value
Financial instruments
Preferred stock of subsidiary	22.4	21.4
Long-term debt, including current portion	$ 17,986.4	$ 15,564.3

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant