Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015, 2014 and 2013.

	2015	2014	2013
Weighted average common shares outstanding	89.8	91.5	90.9
Add: Weighted average restricted stock awards outstanding(a)	—	—	0.1
Basic weighted average common shares outstanding	89.8	91.5	91.0
Add: Dilutive impact of outstanding equity awards	0.9	1.3	1.3
Diluted weighted average common shares outstanding	90.7	92.8	92.3

(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, 2015, 2014 and 2013 because they were anti-dilutive.

	2015		2014		2013
Anti-dilutive stock options	0.4		0.2		0.2
Average exercise price	$	42.50	$	43.51	$	26.83
Year(s) of expiration	2024 - 2025		2024		2023