Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Basic and Diluted Loss Per Share

The following table provides a reconciliation of the data used in the calculation of basic and diluted common shares outstanding for the three years ended December 31, 2014, 2013 and 2012.

	2014	2013	2012
Weighted average common shares outstanding	91.5	90.9	92.7
Add: Weighted average restricted stock awards outstanding(a)	—	0.1	0.3
Basic weighted average common shares outstanding	91.5	91.0	93.0
Add: Dilutive impact of stock options and restricted stock units	1.3	1.3	1.1
Diluted weighted average common shares outstanding	92.8	92.3	94.1

(a) Restricted stock awards containing rights to non-forfeitable dividends which participate in undistributed earnings with common shareholders are considered participating securities for purposes of computing earnings per share.

Number of Shares Underlying Stock Options Excluded from Computation of Diluted Loss

The following table provides the number of shares underlying stock options excluded from the computation of diluted earnings per share for the three years ended December 31, 2014, 2013 and 2012 because they were anti-dilutive.

	2014		2013		2012
Anti-dilutive stock options	0.2		0.2		2.0
Average exercise price	$	43.51	$	26.83	$	21.47
Year(s) of expiration	2024		2023		2014-2022