INCOME TAXES - OPERATING LOSS AND TAX CREDIT CARRYFORWARDS (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating Loss and Tax Credit Carryforwards
Alternative minimum tax credit carryforwards	$ 6.7	$ 5.9
Valuation allowances	10.6	11.5
Operating loss carryforwards, not expected to benefit the entity	157.9	152.0
U.S. Federal Income Tax
Operating Loss and Tax Credit Carryforwards
Net operating losses carryforwards	71.2	74.5
State Income Tax
Operating Loss and Tax Credit Carryforwards
Net operating losses carryforwards	184.5	189.2
Alternative minimum tax credit carryforwards	6.7	5.9
Foreign Income Tax
Operating Loss and Tax Credit Carryforwards
Net operating losses carryforwards	14.0	18.4
Valuation allowances	$ 14.0	$ 18.4