Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-Based Compensation Expense

The table below shows the Company's stock-based compensation expense related to the restricted stock units for the three and nine months ended September 30, 2018 and 2017, respectively, and is included in General and administrative expenses within the Condensed Consolidated Statements of Income:

	Three Months Ended				Nine Months Ended
(millions) (unaudited)	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
Stock-based compensation expense	$	0.3	$	0.2	$	0.6	$	0.6

The table below shows the Company's stock-based compensation expense (reduction of expense) related to the Performance-Based Incentive Program for the three and nine months ended September 30, 2018 and 2017, respectively, and is included in General and administrative expenses within the Condensed Consolidated Statements of Income:

	Three Months Ended					Nine Months Ended
(millions) (unaudited)	September 30, 2018			September 30, 2017		September 30, 2018		September 30, 2017
Stock-based compensation expense	$	(0.4	)	$	0.6	$	0.7	$	1.8