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Net Income Per Share (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator (basic and diluted):
Net income	$ 25.8	$ 22.3	$ 46.3	$ 36.0
Less: Dividends paid to participating securities	0.0	(0.1)	(0.1)	(0.2)
Less: Undistributed earnings available to participating securities	(0.2)	(0.1)	(0.2)	(0.1)
Undistributed and distributed earnings available to common stockholders	$ 25.6	$ 22.1	$ 46.0	$ 35.7
Denominator:
Average number of common shares outstanding (in shares)	30,565,800	30,412,900	30,527,400	30,389,000
Effect of dilutive stock-based compensation (in shares)	140,100	133,800	135,600	128,100
Average number of common and potential common shares outstanding (in shares)	30,705,900	30,546,700	30,663,000	30,517,100

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