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Stockholders' Equity - Basic and Diluted Shares Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator (basic and diluted):
Net income	$ 7.2	$ 41.0	$ 25.8	$ 20.5	$ (27.3)	$ 25.8	$ 22.3	$ 13.7	$ 94.5	$ 34.5	$ 82.8
Less: Dividends paid to participating securities									(0.3)	(0.4)	(0.3)
Less: Undistributed earnings available to participating securities									(0.3)	0.0	(0.2)
Undistributed and distributed earnings available to common stockholders									$ 93.9	$ 34.1	$ 82.3
Denominator:
Average number of common shares outstanding (shares)									30,551,300	30,407,100	30,310,900
Effect of dilutive stock-based compensation (shares)									141,600	142,200	152,500
Average number of common and potential common shares outstanding (shares)									30,692,900	30,549,300	30,463,400

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