Weighted Average Shares Outstanding (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of Weighted Average Shares Outstanding

The effects of potential common stock were determined using the treasury stock method. Weighted average shares outstanding are shown below:

	Three months ended September 30,		Nine months ended September 30,
	2019	2018	2019	2018
Basic shares outstanding	104.0	103.4	103.8	103.2
Effect of potential common stock:
Common stock awards	1.2	1.2	1.2	1.2
Diluted shares outstanding	105.2	104.6	105.0	104.4