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Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation

A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands):

	Three Months Ended
	March 31, 2018				March 31, 2017
Numerator (basic and diluted):
Net income	$	20.5			$	13.7
Less: Dividends paid to participating securities	(0.1		)		(0.1		)
Less: Undistributed earnings available to participating securities	—				—
Undistributed and distributed earnings available to common stockholders	$	20.4			$	13.6
Denominator:
Average number of common shares outstanding	30,488.6				30,364.7
Effect of dilutive stock-based compensation	131.1				122.6
Average number of common and potential common shares outstanding	30,619.7				30,487.3

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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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