Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Stock-Based Compensation Expense

The table below shows the Company's stock-based compensation expense related to the Performance-Based Incentive Program for the three and six months ended June 30, 2019 and 2018, respectively, and is included in General and administrative expenses within the Condensed Consolidated Statements of Income:

	Three Months Ended				Six Months Ended
(millions) (unaudited)	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
Stock-based compensation expense	$	0.6	$	0.6	$	0.8	$	1.1

The table below shows the Company's stock-based compensation expense related to the restricted stock units for the three and six months ended June 30, 2019 and 2018, respectively, and is included in General and administrative expenses within the Condensed Consolidated Statements of Income:

	Three Months Ended				Six Months Ended
(millions) (unaudited)	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
Stock-based compensation expense	$	0.3	$	0.3	$	0.5	$	0.4