LEASES - Balance Sheet Classification (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease assets	$ 71.7	$ 69.8
Property, plant and equipment, net	109.4	91.5
Total lease assets	181.1	161.3
Current operating lease liabilities	13.7	12.9
Current maturities of long-term debt	21.1	24.2
Long-term operating lease liabilities	61.0	59.7
Long-term debt, net of current maturities	61.7	43.1
Total lease liabilities	157.5	139.9
Accumulated amortization	$ 33.3	$ (29.4)
Operating leases, weighted-average remaining lease term (years)	6 years 7 months 6 days	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)	5.80%	6.20%
Finance leases, weighted-average discount rate (percent)	3.70%	3.80%