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Net Income Per Share(Tables)

3 Months Ended

Mar. 31, 2015

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, 2015				March 31, 2014
Numerator (basic and diluted):
Net income	$	18.8			$	23.2
Less: Dividends paid to participating securities	(0.2		)		(0.1		)
Less: Undistributed earnings available to participating securities	—				(0.1		)
Undistributed and distributed earnings available to common stockholders	$	18.6			$	23.0
Denominator:
Average number of common shares outstanding	30,178.3				30,665.9
Effect of dilutive stock-based compensation	114.9				112.3
Average number of common and potential common shares outstanding	30,293.2				30,778.2

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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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