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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 28.4	$ 21.7	$ 78.7	$ 61.5
Weighted average shares outstanding - Basic (shares)	60.2	60.0	60.1	59.9
Dilutive effect of common stock equivalents (shares)	1.2	1.1	1.2	1.1
Weighted average shares outstanding - Diluted (shares)	61.4	61.1	61.3	61.0
Basic earnings per share:
Earnings per share (usd per share)	$ 0.47	$ 0.36	$ 1.31	$ 1.03
Diluted earnings per share:
Net earnings per share (usd per share)	$ 0.46	$ 0.36	$ 1.28	$ 1.01

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