RECENT ACCOUNTING PRONOUNCEMENTS Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit recorded to equity section of balance sheet		$ 0.0	$ 3.4
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit recorded to tax expense	$ 0.1	1.2
Excess tax benefit recorded to equity section of balance sheet		(3.4)
Previously Unrecognized Tax Benefits Due to NOL Carryforwards [Member] | Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax		(2.1)
Forfeiture Rate Estimate Adjustment [Member] | Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax		(1.6)
Deferred Tax Assets [Member] | Previously Unrecognized Tax Benefits Due to NOL Carryforwards [Member] | Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax		(25.6)
Valuation Allowance, Operating Loss Carryforwards [Member] | Previously Unrecognized Tax Benefits Due to NOL Carryforwards [Member] | Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax		$ (23.5)