Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016, 2015 and 2014.

	2016	2015	2014
Basic weighted average common shares outstanding	89.2	89.8	91.5
Add: Dilutive impact of outstanding equity awards	0.7	0.9	1.3
Diluted weighted average common shares outstanding	89.9	90.7	92.8

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, 2016, 2015 and 2014 because they were anti-dilutive.

	2016		2015		2014
Anti-dilutive stock options	0.7		0.4		0.2
Average exercise price	$	38.34	$	42.50	$	43.51
Year(s) of expiration	2024 - 2026		2024 - 2025		2024