LEASES (Lease Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Lease right of use assets - affiliate			$ 853.9
Finance lease assets	$ 80.4	$ 24.2
Lease right of use assets - third party	1,487.7	980.6
Current operating lease liabilities	163.9
Current finance lease liabilities	14.4	6.5
Long-term lease obligations	1,241.3
Long-term finance lease liabilities	68.3	18.4
Lease Liability	1,487.9	980.1
Third Party Lease [Member]
Lease right of use assets - affiliate	836.3	306.1
Lease right of use assets - third party	916.7	330.3
Current operating lease liabilities	78.3	72.0
Long-term lease obligations	755.9	232.9
Long-term finance lease liabilities	68.3	18.4
Lease with Affiliate [Member]
Lease right of use assets - affiliate	571.0	650.3
Current operating lease liabilities	85.6	79.2
Long-term lease obligations	$ 485.4	$ 571.1