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Earnings Per Share - Reconciliation of Net Income to Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 17.5	$ 12.9
Weighted average shares outstanding - Basic (shares)	60.1	59.8
Dilutive effect of common stock equivalents (shares)	1.1	1.0
Weighted average shares outstanding - Diluted (shares)	61.2	60.8
Basic earnings per share:
Earnings per share (usd per share)	$ 0.29	$ 0.22
Diluted earnings per share:
Net earnings per share (usd per share)	$ 0.29	$ 0.21

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