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Stock-Based Compensation (Tables)
 3 Months Ended
Sep. 30, 2020
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 (Loss):
Three months ended September 30,Nine months ended September 30,
 2020201920202019
 (In millions)
Total stock-based compensation expense:
Equity classified awards expense
$2.5 $2.4 $9.2 $8.3 
Liability classified awards expense1.1 0.2 0.6 2.6 
Total pre-tax stock-based compensation expense3.6 2.6 9.8 10.9 
Book income tax benefit(0.9)(0.6)(2.4)(2.8)
Total stock-based compensation expense, net of tax$2.7 $2.0 $7.4 $8.1 
Schedule of stock option valuation assumptions The following summarizes the assumptions used in the Black-Scholes model:
Risk-free interest rate1.2 %
Weighted average historical volatility30.5 %
Dividend yield3.5 %
Expected years until exercise4.6
Weighted average fair value of options granted$17.53
Schedule of stock option activity Stock option balances at September 30, 2020, and activity for the nine months ended September 30, 2020 were as follows:
 SharesWeighted
Average
Exercise
Price		Weighted Average
Remaining
Contractual Term
(in Years)		Aggregate
Intrinsic
Value (in Millions)
Outstanding at December 31, 20191,217,438 $66.43   
Granted167,969 87.17   
Exercised(270,024)76.01   
Expired(48,119)112.58 
Forfeited(45,247)86.39   
Outstanding at September 30, 20201,022,017 64.25 6.7$5.5 
Vested at September 30, 2020 and Expected to Vest983,454 63.99 6.7$5.3 
Exercisable at September 30, 2020423,261 $70.54 5.3$0.4 
Schedule of restricted stock unit activity
Outstanding balances as of September 30, 2020, and activity related to restricted stock and restricted stock units for the nine months ended September 30, 2020 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, 2019224,515 $70.52 357,807 $30.35 
Granted127,041 75.86 30,997 77.33 
Released(93,160)55.58 (33,234)63.98 
Forfeited(38,172)85.01 — — 
Outstanding at September 30, 2020220,224 $78.12 355,570 $28.01 
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, 201963,852 
Granted2,658 
Released(1,426)
Forfeited(11,603)
Outstanding at September 30, 202053,481