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Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator (in millions):
Net income/(loss) available to common stockholders	$ 22.4	$ (39.7)	$ 45.8	$ (6.6)
Denominator (in thousands):
Weighted average common shares outstanding	24,628	24,564	24,615	24,547
Dilutive effect of stock options and awards	241	0	241	0
Denominator for diluted earnings per share	24,869	24,564	24,856	24,547
Net income/(loss) per share, basic:	$ 0.91	$ (1.62)	$ 1.86	$ (0.27)
Net income/(loss) per share, diluted:	$ 0.90	$ (1.62)	$ 1.84	$ (0.27)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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