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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 21.4	$ 32.8	$ 44.8	$ 50.3
Weighted average shares outstanding - Basic (shares)	60.1	60.1	60.3	60.1
Dilutive effect of common stock equivalents (shares)	1.2	1.2	1.3	1.1
Weighted average shares outstanding - Diluted (shares)	61.3	61.3	61.6	61.2
Basic earnings per share:
Earnings per share (usd per share)	$ 0.36	$ 0.55	$ 0.74	$ 0.84
Diluted earnings per share:
Net earnings per share (usd per share)	$ 0.35	$ 0.54	$ 0.73	$ 0.82

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