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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted Average Number of Shares Outstanding Reconciliation
Net Income	$ 200.3	$ 174.7	$ 157.7
Weighted-average number of common shares outstanding - basic	52.7	52.8	52.3
Dilutive effect of share equivalents	0.6	0.6	0.8
Weighted Average Number of Shares Outstanding, Diluted, Total	53.3	53.4	53.1
Basic earnings per share	$ 3.80	$ 3.31	$ 3.02
Diluted earnings per share	$ 3.76	$ 3.28	$ 2.98
Number of anti-dilutive share equivalents		0.0	0.0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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