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Stockholders' Equity - (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Employee Equity-Based Compensation Expense
Quarter Ended September 30,Nine Months Ended September 30,
2021202020212020
Total stock-based compensation expense
(selling, general and administrative and other operating charges, net)
$3.8 $2.5 $6.9 $7.3 
Income tax benefit related to stock-based compensation$1.0 $0.6 $1.8 $1.9 
Impact on cash flow due to taxes paid related to net share settlement of equity awards and proceeds from sale of stock under employee awards$— $— $1.2 $0.7