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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator (in millions):
Net (loss)/income available to common stockholders	$ (39.7)	$ 22.3	$ (6.6)	$ 51.0
Denominator (in thousands):
Weighted average common shares outstanding	24,564	24,483	24,547	24,468
Dilutive effect of stock options and awards	0	195	0	203
Denominator for diluted earnings per share	24,564	24,678	24,547	24,671
Net (loss)/income per share, basic:	$ (1.62)	$ 0.91	$ (0.27)	$ 2.08
Net (loss)/income per share, diluted:	$ (1.62)	$ 0.90	$ (0.27)	$ 2.07

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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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