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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 21.7	$ 12.5	$ 61.5	$ 31.2
Weighted average shares outstanding - Basic (shares)	60.0	59.8	59.9	59.7
Dilutive effect of common stock equivalents (shares)	1.1	0.8	1.1	0.7
Weighted average shares outstanding - Diluted (shares)	61.1	60.6	61.0	60.4
Basic earnings per share:
Net earnings per share (usd per share)	$ 0.36	$ 0.21	$ 1.03	$ 0.52
Diluted earnings per share:
Net earnings per share (usd per share)	$ 0.36	$ 0.21	$ 1.01	$ 0.52

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