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Acquisitions and Discontinued Operations - Unaudited Pro Forma Information (Details) - Cues, Inc. $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares
Business Acquisition [Line Items]
Revenues | $	$ 1,546.7
Income from continuing operations | $	90.8
Net income | $	$ 90.1
Income from continuing operations per share of common stock:
Basic (usd per share)	$ 2.11
Diluted (usd per share)	2.03
Net income per share of common stock:
Basic (usd per share)	2.09
Diluted (usd per share)	$ 2.02

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