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Net Income Per Share (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator (basic and diluted):
Net income	$ 20.5	$ 25.8	$ 37.9	$ 46.3
Less: Dividends paid to participating securities	(0.1)	0.0	(0.2)	(0.1)
Less: Undistributed earnings available to participating securities	(0.1)	(0.2)	(0.1)	(0.2)
Undistributed and distributed earnings available to common stockholders	$ 20.3	$ 25.6	$ 37.6	$ 46.0
Denominator:
Average number of common shares outstanding (in shares)	30,661,400	30,565,800	30,641,100	30,527,400
Effect of dilutive stock-based compensation (in shares)	147,900	140,100	149,900	135,600
Average number of common and potential common shares outstanding (in shares)	30,809,300	30,705,900	30,791,000.0	30,663,000

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