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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, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 20.5	$ 22.2
Weighted average shares outstanding - Basic (shares)	60.7	60.6
Dilutive effect of common stock equivalents (shares)	0.7	1.1
Weighted average shares outstanding - Diluted (shares)	61.4	61.7
Basic earnings per share:
Earnings per share (usd per share)	$ 0.34	$ 0.37
Diluted earnings per share:
Earnings per share (usd per share)	$ 0.33	$ 0.36

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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