LEASES - Balance Sheet Classification (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease assets	$ 70.3	$ 69.8
Property, plant and equipment, net	$ 109.6	91.5
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:AssetsAbstract
Total lease assets	$ 179.9	161.3
Current operating lease liabilities	13.7	12.9
Current maturities of long-term debt	$ 24.3	24.2
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:DebtCurrent
Long-term operating lease liabilities	$ 59.8	59.7
Long-term debt, net of current maturities	$ 60.6	43.1
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations
Total lease liabilities	$ 158.4	139.9
Accumulated amortization	$ 36.5	$ 29.4
Operating leases, weighted-average remaining lease term (years)	6 years 6 months	6 years 7 months 6 days
Finance leases, weighted-average remaining lease term (years)	3 years 9 months 18 days	3 years 4 months 24 days
Operating leases, weighted-average discount rate (percent)	5.70%	6.20%
Finance leases, weighted-average discount rate (percent)	3.60%	3.80%