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Earnings Per Share - Computation of Basic and Diluted Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income, basic and diluted	$ 9.4	$ 46.2	$ 12.4	$ 35.8
Denominator:
Basic weighted average common shares	28.7	28.5	28.7	28.4
Stock options, RSUs and PSUs	0.4	0.4	0.4	0.5
Weighted average shares used to calculate diluted earnings (loss) per share	29.1	28.9	29.1	28.9
Basic	$ 0.33	$ 1.62	$ 0.43	$ 1.26
Earnings per share:
Diluted	$ 0.32	$ 1.60	$ 0.43	$ 1.24
Antidilutive stock options, RSUs and PSUs
Earnings per share:
Antidilutive stock options, RSUs and PSUs	0.2	0.2	0.3	0.2

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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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