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Net Income Per Share (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator (basic and diluted):
Net income	$ 41.0	$ 25.8	$ 87.3	$ 61.8
Less: Dividends paid to participating securities	(0.1)	(0.1)	(0.2)	(0.3)
Less: Undistributed earnings available to participating securities	(0.2)	(0.1)	(0.4)	(0.2)
Undistributed and distributed earnings available to common stockholders	$ 40.7	$ 25.6	$ 86.7	$ 61.3
Denominator:
Average number of common shares outstanding (in shares)	30,569,600	30,422,800	30,541,600	30,400,400
Effect of dilutive stock-based compensation (in shares)	153,200	146,700	141,500	134,300
Average number of common and potential common shares outstanding (in shares)	30,722,800	30,569,500	30,683,100	30,534,700

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