STOCKHOLDERS' EQUITY - Capital Stock (Details) shares in Millions, $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($) shares
Equity [Abstract]
Issuance of common stock under equity program, shares \| shares	1.1
Proceeds from issuance of common stock sold under equity program	$ 73.9
Equity offering program, remaining authorized offering amount	$ 155.6

Stock Issued During Period, Value, New Issues, Equity Offering Program

No definition available.

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Balance Type:	credit
Period Type:	duration