Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017 and 2016, respectively, which is included in General and administrative expenses within the Condensed Consolidated Statements of Income.

	Three Months Ended				Nine Months Ended
(millions) (unaudited)	September 30, 2017		September 30, 2016		September 30, 2017		September 30, 2016
Stock-based compensation expense	$	0.2	$	0.2	$	0.6	$	0.6

The table below shows the Company's stock-based compensation expense related to the vested stock grants for the three and nine months ended September 30, 2017 and 2016, 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, 2017		September 30, 2016		September 30, 2017		September 30, 2016
Stock-based compensation expense	$	—	$	—	$	0.5	$	0.7

The table below shows the Company's stock-based compensation expense related to the Performance-Based Incentive Program for the three and nine months ended September 30, 2017 and 2016, 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, 2017		September 30, 2016		September 30, 2017		September 30, 2016
Stock-based compensation expense	$	0.6	$	0.5	$	1.8	$	1.5