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AQUISITIONS AND DISCONTINUED OPERATIONS - Pro Forma Results (Details) - Cues, Inc. - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Business Acquisition [Line Items]
Revenues	$ 395.9	$ 765.2
Income from continuing operations	23.6	36.3
Net income	$ 26.9	$ 39.6
Income from continuing operations per share of common stock, basic (USD per share)	$ 0.55	$ 0.85
Income from continuing operations per share of common stock, diluted (USD per share)	0.53	0.81
Net income per share of common stock, basic (USD per share)	0.63	0.92
Net income per share of common stock, diluted (USD per Share)	$ 0.60	$ 0.89

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