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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 29.2	$ 25.3	$ 81.1	$ 70.1
Weighted average shares outstanding - Basic (shares)	60.9	60.3	60.8	60.3
Dilutive effect of common stock equivalents (shares)	0.8	1.0	1.0	1.2
Weighted average shares outstanding - Diluted (shares)	61.7	61.3	61.8	61.5
Basic earnings per share:
Earnings per share (usd per share)	$ 0.48	$ 0.42	$ 1.33	$ 1.16
Diluted earnings per share:
Earnings per share (usd per share)	$ 0.47	$ 0.41	$ 1.31	$ 1.14

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