Stockholders' Equity

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Equity-Based Compensation

STOCKHOLDERS' EQUITY

Common Stock Plans

We have stock-based compensation plans under which restricted stock awards and stock options are granted according to time or performance vesting requirements. At June 30, 2020, approximately 1.3 million shares were available for future issuance under our current plan.

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Total stock-based compensation expense (selling, general and administrative and other operating charges, net)	$	3.4	$	1.2	$	4.8	$	2.1
Income tax benefit related to stock-based compensation	$	0.9	$	0.3	$	1.3	$	0.5
Impact on cash flow due to taxes paid related to net share settlement of equity awards	$	—	$	—	$	0.7	$	0.4

At June 30, 2020, $12.2 million of compensation cost related to unvested restricted stock units, performance awards and stock options attributable to future service had not yet been recognized.

During the first six months ended June 30, 2020, we granted 371,267 restricted stock units (time vesting) at an average grant date fair value of $23.18 per share and 120,382 restricted stock units (performance vesting) at an average grant date fair value of $27.67.