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Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator (in millions):
Net income available to common stockholders	$ 93.1	$ 28.7	$ 112.2
Denominator (in thousands):
Weighted average common shares outstanding	24,647	24,563	24,482
Dilutive effect of stock options and awards	207	216	246
Denominator for diluted earnings per share	24,854	24,779	24,728
Net income per share, basic:	$ 3.78	$ 1.17	$ 4.58
Net income per share, diluted:	$ 3.75	$ 1.16	$ 4.54

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- Definition

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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-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1505-109256

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256

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- References

No definition available.

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