OTHER ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Other Assets [Abstract]
Supply contracts	$ 1,052.9	$ 1,026.9	$ 1,052.9	$ 1,026.9	$ 1,048.0
Other	55.7	63.1	55.7	63.1	54.5
Other assets	1,108.6	1,090.0	1,108.6	1,090.0	$ 1,102.5
Amortization of Supply Contracts	$ 17.8	$ 17.6	$ 35.6	$ 35.2