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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock-Based Compensation Expense by Type of Award
The following table summarizes stock-based compensation expense by type of award:
 Year Ended December 31,
 202120202019
 (In millions)
SARs$2.0 $8.1 $11.4 
Restricted stock and restricted stock units, service based6.3 8.6 5.2 
Restricted stock and restricted stock units, performance based11.9 12.6 9.4 
Employee stock purchase plan ("ESPP")0.5 1.1 0.9 
Stock options— 1.0 0.4 
Total stock-based compensation expense$20.7 $31.4 $27.3 
Summary of Stock Appreciation Rights
The following table summarizes the status of the Company’s SARs:
 SARs
(In millions) 		Weighted
Average
Exercise Price		Weighted
Average
Remaining
Contractual
Life (years) 		Aggregate
Intrinsic
Value
(In millions) 
Outstanding at December 31, 20200.9 $24.09 
Canceled(0.1)30.51 
Outstanding at December 31, 20210.8 $24.46 3.2$18.5 
Exercisable at December 31, 20210.7 $23.54 3.1$17.2 
Expected to vest at December 31, 20210.1 $32.39 4.2$1.2 
Summary of Restricted Stock Units The following table summarizes the status of the Company’s service-based restricted stock:
 Service
Based
Restricted
Stock
(In millions)  		Weighted
Average
Grant Date
Fair Value 
Outstanding at December 31, 20200.2 $39.90 
Exercised(0.1)36.61 
Outstanding and expected to vest at December 31, 20210.1 $45.97 
The following table summarizes the status of the Company’s service-based restricted stock units:
 Service
Based
Restricted
Stock Units
(In millions)  		Weighted
Average
Grant Date
Fair Value 
Outstanding at December 31, 20200.1 $46.00 
Granted0.1 48.61 
Outstanding and expected to vest at December 31, 20210.2 $47.10 
The following table summarizes the status of the Company’s performance-based restricted stock:
 Performance
Based
Restricted
Stock
(In millions)		Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 20200.5 $36.59 
Exercised(0.1)27.76 
Canceled(0.1)41.60 
Outstanding at December 31, 20210.3 $40.31 
Expected to vest at December 31, 20210.3 $38.71 
The following table summarizes the status of the Company’s performance-based restricted stock units:
 Performance
Based
Restricted
Stock Units
(In millions)		Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 20200.4 $50.00 
Granted0.7 48.64 
Canceled(0.1)51.10 
Outstanding at December 31, 20211.0 $49.12 
Expected to vest at December 31, 20210.6 $49.15 
Schedule of Weighted Average Assumptions Used to Determine Fair Value of Stock Awards The following table presents the weighted average assumptions used to value the units for 2020:
Expected life (in years)0.67
Volatility35.41 %
Risk-free interest rate0.72 %
Dividend yield— %
The following table presents the weighted average assumptions used to value the SARs:
 Year Ended December 31,
 202120202019
Expected life (in years)3.20.74.9
Volatility38.17 %48.30 %34.79 %
Risk-free interest rate0.94 %0.11 %1.69 %
Dividend yield— %— %— %