LEASES - Supplemental Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
LEASES
Operating lease right of use assets	$ 114.0	$ 53.4
Financial position	us-gaap:OtherAssetsNoncurrent
Current operating leased liabilities	$ 9.6	8.7
Financial position	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Non-current operating lease liabilities	$ 128.3	46.7
Financial position	us-gaap:OperatingLeaseLiabilityNoncurrent
Total lease liabilities	$ 137.9	$ 55.4
Financial position	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent