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Stock-Based Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The following table summarizes the Company's stock-based compensation expense included as a component of general and administrative expenses in the consolidated financial statements:
 Year Ended December 31,
 202120202019
 (In millions)
Total stock-based compensation expense:   
Equity classified awards expense$11.6 $12.6 $10.9 
Liability classified awards expense2.3 1.0 3.2 
Total pretax stock-based compensation expense13.913.614.1
Book income tax benefit(3.5)(3.4)(3.5)
Total stock-based compensation expense, net of tax$10.4 $10.2 $10.6 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table summarizes the assumptions used in the Black-Scholes model for stock options granted in the years ended December 31, 2021, 2020 and 2019:
202120202019
Risk free interest rate0.5 %1.2 %2.5 %
Weighted average historical volatility67.7 %30.5 %30.3 %
Dividend yield— %3.5 %2.8 %
Expected years until exercise4.54.64.7
Weighted average fair value of options granted$40.25 $17.53 $21.93 
Schedule of Share-based Compensation, Stock Options, Activity
Stock option activity for the years ended December 31, 2021, 2020 and 2019 is summarized as follows:
Number of
Shares Under Option		Weighted Average
Exercise Price
Per Share		Weighted Average
Remaining Contractual
Term (in Years)		Aggregate Intrinsic
Value (in Millions)
Outstanding at December 31, 20181,439,708 $63.21   
Granted132,832 98.97   
Exercised(211,352)57.36   
Forfeited(106,745)72.19   
Expired(37,005)93.06   
Outstanding at December 31, 20191,217,438 66.43   
Granted167,969 87.17   
Exercised(270,024)76.01   
Forfeited(45,247)86.39   
Expired(55,466)107.78   
Outstanding at December 31, 20201,014,670 64.16   
Granted95,891 75.28   
Exercised(524,536)48.79   
Forfeited(59,468)88.39   
Expired(50,653)98.61   
Outstanding at December 31, 2021475,904 $76.65 6.8$3.5 
Vested and Expected to Vest at December 31, 2021462,179 $76.59 6.7$3.5 
Exercisable at December 31, 2021296,959 $73.28 5.7$3.0 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
Activity in equity classified awards of restricted stock and restricted stock units for the years ended December 31, 2021, 2020 and 2019 is as follows:

Shares of Restricted Stock		Weighted Average
Grant-Date
Per Share Fair Value		Restricted
Stock Units		Weighted Average
Grant-Date
Per Share Fair Value
Outstanding at December 31, 2018267,242 $64.21 374,529 $31.05 
Granted75,556 96.86 23,427 95.77 
Released(76,962)76.25 (12,347)90.34 
Forfeited(41,321)67.20 (27,802)34.53 
Outstanding at December 31, 2019224,515 70.52 357,807 30.35 
Granted163,522 73.68 30,997 77.33 
Released(95,211)55.75 (33,234)63.98 
Forfeited(38,495)85.03 — — 
Outstanding at December 31, 2020254,331 76.50 355,570 28.01 
Granted141,264 83.24 68,998 63.04 
Released(60,407)66.90 (318,976)23.19 
Forfeited(58,577)82.09 — — 
Outstanding at December 31, 2021276,611 $80.85 105,592 $71.00 
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, 201853,766 
Granted20,989 
Released(462)
Forfeited(10,441)
Outstanding at December 31, 201963,852 
Granted2,658 
Released(1,426)
Forfeited(12,128)
Outstanding at December 31, 202052,956 
Granted— 
Released(38,916)
Forfeited(1,241)
Outstanding at December 31, 202112,799