OTHER ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Other Assets [Abstract]
Supply contracts	$ 1,026.9	$ 1,091.0	$ 1,026.9	$ 1,091.0	$ 1,061.8
Other	63.1	74.9	63.1	74.9	70.0
Other assets	1,090.0	1,165.9	1,090.0	1,165.9	$ 1,131.8
Amortization of Supply Contracts	$ 17.6	$ 17.3	$ 35.2	$ 34.8