LEASES - Balance Sheet Implication (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets
Operating right-of-use assets	$ 160.1	$ 175.4
Finance right-of-use assets	1.9	2.4
Total right-of-use assets	162.0	177.8
Current
Operating lease liabilities	44.3	45.7
Finance lease liabilities	0.6	1.0
Total current lease liabilities	44.9	46.7
Noncurrent
Operating lease liabilities	129.3	143.3
Finance lease liabilities	1.5	1.4
Total noncurrent lease liabilities	130.8	144.7
Total lease liability	$ 175.7	$ 191.4
Finance lease assets, statement of financial position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Current operating lease liability, statement of financial position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Current finance lease liability, statement of financial position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Noncurrent finance lease liability, statement of financial position [Extensible List]	us-gaap:LongTermDebtNoncurrent	us-gaap:LongTermDebtNoncurrent