INCOME TAXES - OPERATING LOSS AND TAX CREDIT CARRYFORWARDS (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Operating Loss and Tax Credit Carryforwards
Alternative minimum tax credit carryforwards	$ 31.0	$ 3.6
Valuation allowances	11.9	12.6
U.S. Federal Income Tax
Operating Loss and Tax Credit Carryforwards
Net operating losses carryforwards	190.0	194.2
State Income Tax
Operating Loss and Tax Credit Carryforwards
Net operating losses carryforwards	192.8	192.4
Foreign Income Tax
Operating Loss and Tax Credit Carryforwards
Net operating losses carryforwards	$ 17.6	$ 20.2