Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018, 2017 and 2016.

	2018	2017	2016
Basic weighted average common shares outstanding	87.7	88.3	89.2
Add: Dilutive impact of outstanding equity awards	1.0	0.7	0.7
Diluted weighted average common shares outstanding	88.7	89.0	89.9

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 years ended December 31, 2017 and 2016 because they were anti-dilutive. There were no anti-dilutive shares underlying stock options excluded from the computation of diluted earnings per share for the year ended December 31, 2018.

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