LEASES - Supplemental Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
LEASES
Operating lease right of use assets	$ 117.8	$ 53.4
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Current operating leased liabilities	$ 10.7	8.7
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Non-current operating lease liabilities	$ 137.3	46.7
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityNoncurrent
Total lease liabilities	$ 148.0	$ 55.4