Earnings Per Share

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Share

EARNINGS PER SHARE DATA

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, 2017, 2016 and 2015.

	2017	2016	2015
Basic weighted average common shares outstanding	88.3	89.2	89.8
Add: Dilutive impact of outstanding equity awards	0.7	0.7	0.9
Diluted weighted average common shares outstanding	89.0	89.9	90.7

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, 2017, 2016 and 2015 because they were anti-dilutive.

	2017		2016		2015
Anti-dilutive stock options	0.3		0.7		0.4
Average exercise price	$	42.43	$	38.34	$	42.50
Year(s) of expiration	2024 - 2025		2024 - 2026		2024 - 2025

In addition, 0.1 of outstanding employee PSU awards (see Note 16, Long-Term Incentive Employee Compensation, for additional information on PSU awards) were excluded from the computation of diluted earnings per share for the years ended December 31, 2017, 2016 and 2015, respectively, as the necessary performance conditions had not yet been satisfied.