Stockholders' Equity - (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Employee Equity-Based Compensation Expense

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Total stock-based compensation expense (selling, general and administrative and other operating charges, net)	$	2.5	$	0.9	$	7.3	$	3.0
Income tax benefit related to stock-based compensation	$	0.6	$	0.2	$	1.9	$	0.8
Impact on cash flow due to taxes paid related to net share settlement of equity awards	$	—	$	—	$	0.7	$	0.4