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Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Summary of Earnings Per Share

Per share amounts are computed as follows:

		2017				2016				2015
Numerator (in millions):
Net income available to common stockholders		$	61.8			$	81.3			$	119.5
Denominator (in thousands):
Weighted average common shares outstanding			24,148				23,998				24,107
Dilutive effect of stock options and awards			338				444				505
Denominator for diluted earnings per share			24,486				24,442				24,612
Net income per share, basic:		$	2.56			$	3.39			$	4.96
Net income per share, diluted:		$	2.52			$	3.33			$	4.86

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- References

No definition available.

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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