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AQUISITIONS AND DISCONTINUED OPERATIONS - Pro Forma Results (Details) - Cues, Inc. $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares
Business Acquisition [Line Items]
Revenues | $	$ 369.3
Income from continuing operations | $	12.7
Net income | $	$ 12.7
Income from continuing operations per share of common stock, basic (USD per share)	$ 0.30
Income from continuing operations per share of common stock, diluted (USD per share)	0.29
Net income per share of common stock, basic (USD per share)	0.30
Net income per share of common stock, diluted (USD per Share)	$ 0.29

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