INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 90.8	$ (2.4)
Income Taxes, Amount of Operating Losses Subject to Limitation	233.5
Income Taxes, Incomplete Accounting, Operating Loss Not Utilized	209.0
Income Taxes, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense	81.9
Income Taxes, Amount of Operating Losses Not Subject to Limitation	3.7
Income Taxes, Cancellation of Indebtedness, Amount Recognized for Income Taxes	26.2
Income Taxes, Cancellation of Indebtedness, Reduction to Net Operating Losses	26.2
Income Taxes, Cancellation of Indebtedness, Reduction to Gross Deferred Tax Assets and Valuation Allowance	10.2
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense	7.2
Capital Loss Carryforwards	11.4	$ 9.0
Operating loss periods between November 2003 and March 2006 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards
Annual limitation on operating loss carryforwards
Operating loss periods after March 2006 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	24.3
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0.6
UNITED STATES | Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards
AUSTRALIA | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards