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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 29.7	$ 21.4	$ 51.9	$ 44.8
Weighted average shares outstanding - Basic (shares)	60.9	60.1	60.8	60.3
Dilutive effect of common stock equivalents (shares)	0.9	1.2	1.0	1.3
Weighted average shares outstanding - Diluted (shares)	61.8	61.3	61.8	61.6
Basic earnings per share:
Earnings per share (usd per share)	$ 0.49	$ 0.36	$ 0.85	$ 0.74
Diluted earnings per share:
Earnings per share (usd per share)	$ 0.48	$ 0.35	$ 0.84	$ 0.73

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