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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
The following table summarizes stock-based compensation by type of award:
Three months ended March 31,
 20222021
 (In millions)
Stock Appreciation Rights
$(4.9)$(1.7)
Restricted stock and restricted stock units, service based1.4 1.3 
Restricted stock and restricted stock units, performance based2.6 2.9 
Employee stock purchase plan — 0.3 
Total stock-based compensation (benefit) expense $(0.9)$2.8