Stockholders' Equity - (Tables)

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Employee Equity-Based Compensation Expense

	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