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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Components of the Company’s Stock-Based Compensation Expense
The following table summarizes the components of stock-based compensation expense included in general and administrative expenses in the Consolidated Statements of Comprehensive Income:
Three months ended March 31,
 20222021
Total stock-based compensation expense:(In millions)
Equity classified awards expense
$4.4 $3.1 
Liability classified awards expense0.4 1.5 
Total pre-tax stock-based compensation expense4.8 4.6 
Book income tax benefit(1.2)(1.1)
Total stock-based compensation expense, net of tax$3.6 $3.5 
Schedule of Stock Option Valuation Assumptions
The following table summarizes the assumptions used in the Black-Scholes model for stock options granted during the three months ended March 31, 2022.

Risk-free interest rate1.7 %
Historical volatility70.1 %
Dividend yield2.6 %
Expected years until exercise4.5
Fair value of options granted$33.23
Schedule of Stock Option Activity Stock option balances at March 31, 2022, and activity for the three months ended March 31, 2022 were as follows:
 SharesWeighted
Average
Exercise
Price		Weighted Average
Remaining
Contractual Term
(in Years)		Aggregate
Intrinsic
Value (in Millions)
Outstanding at December 31, 2021475,904 $76.65   
Granted75,795 70.08   
Exercised(3,505)68.08   
Forfeited(2,635)90.54   
Outstanding at March 31, 2022545,559 75.72 7.0$3.9 
Vested at March 31, 2022 and Expected to Vest522,263 75.82 6.9$3.7 
Exercisable at March 31, 2022374,716 $75.93 6.0$3.1 
Schedule of Restricted Stock Unit Activity
Outstanding balances as of March 31, 2022, and activity related to restricted stock and restricted stock units for the three months ended March 31, 2022 were as follows:
 Restricted
Stock		Weighted
Average
Grant Date
Fair Value		Stock-Settled Restricted
Stock Units		Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2021276,611 $80.85 105,592 $71.00 
Granted167,797 70.09 59,002 46.64 
Released(56,687)89.34 (40,599)66.31 
Forfeited(6,667)86.86 — — 
Outstanding at March 31, 2022381,054 $74.77 123,995 $61.01 
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
The Company has granted cash-settled restricted stock units to certain employees. These instruments are recorded as liabilities at fair value as of the respective period end.
 Cash-Settled Restricted
Stock Units
Outstanding at December 31, 202112,799 
Granted67 
Released(12,866)
Outstanding at March 31, 2022—