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DERIVATIVES - Schedule of Derivative Liabilities at Fair Value (Details) - Fair Value Hedges - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2014
Interest Rate Swaps - 2019 Note \| Notes 4.90 Percent Due 2019
Derivative [Line Items]
Derivative, Fixed Interest Rate				4.90%
Derivative, Variable Interest Rate				3.14%
Derivative Asset, Fair Value, Gross Asset	$ (0.5)	$ 1.1
Interest Rate Swaps - 2020 Note \| Notes 3.00 Percent Due 2020
Derivative [Line Items]
Derivative, Fixed Interest Rate			3.00%
Derivative, Variable Interest Rate			1.38%
Derivative Liability, Fair Value, Gross Liability	$ (7.9)	$ (6.3)