STOCKHOLDER'S EQUITY - Schedule of Company's Equity Units (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	0 Months Ended	1 Months Ended	12 Months Ended
	Jun. 11, 2014	Jun. 30, 2014	Sep. 30, 2014
Capital Unit [Line Items]
Number of Equity Units issued (in shares)	2,875	2,875
Proceeds from Sale of Interest in Corporate Unit	$ 139.4
Equity Units, Contract Annual Rate	4.75%
Stock issued costs related to purchase contract liability	19.7		19.7
Junior Subordinated Debt
Capital Unit [Line Items]
Proceeds from convertible debt	$ 143.8	$ 143.8