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Stock Transactions And Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Summary of Share Activity
The following table summarizes the Company’s stock activity (shares in millions):
Year Ended December 31,
202420232022
Common stock - shares issued:
Balance, beginning of period173.3 163.7 162.0 
Issuance of common stock 0.9 9.6 1.7 
Balance, end of period174.2 173.3 163.7 
Summary of Assumption Used in the Black-Scholes Value Options Granted
The following summarizes the assumptions used in the Black-Scholes model to value Options granted during the years ended December 31:
202420232022
Risk-free interest rate
3.7 – 4.5%
3.9 – 4.4%
1.9 – 3.1%
Weighted average volatility34.9 %35.2 %33.6 %
Dividend yield— %— %— %
Expected years until exercise
6.0
6.0
6.0
Components Of Stock-Based Compensation Program
The following summarizes the components of the Company’s stock-based compensation expense for the years ended December 31 ($ in millions):
202420232022
RSUs / PSUs$25.7 $20.3 $19.3 
Options / PSOs9.6 10.4 11.2 
Total stock-based compensation expense$35.3 $30.7 $30.5 
Schedule of Option Activity
The following summarizes the Company’s Option and PSO activity (in millions; except price per share and numbers of years):
Number of Stock Options / PSOs
Weighted
Average
Exercise Price
Weighted Average
Remaining
Contractual Term
(in years)
Aggregate
Intrinsic
Value
Outstanding as of December 31, 20217.9 $24.16 
Granted
0.5 $48.23 
Exercised
(1.2)$18.61 
Cancelled/forfeited
(0.7)$30.29 
Outstanding as of December 31, 20226.5 $26.24 
Granted
0.4 $38.03 
Exercised
(0.6)$18.87 
Cancelled/forfeited
(0.7)$35.19 
Outstanding as of December 31, 20235.6 $26.90 
Granted
2.6 $19.67 
Exercised
(0.2)$15.04 
Cancelled/forfeited
(0.6)$29.24 
Outstanding as of December 31, 20247.4 $24.51 5.9$4.1 
Vested and expected to vest as of December 31, 2024
7.0 $24.80 5.6$3.8 
Vested as of December 31, 2024
4.7 $25.58 4.3$2.8 
Schedule of Options Outstanding
Options and PSOs outstanding as of December 31, 2024 are summarized below (in millions; except price per share and numbers of years):
OutstandingExercisable
Exercise PriceNumber of Stock Options / PSOsAverage
Exercise Price		Average
Remaining
Life
(in years)		Number of Stock Options / PSOsAverage
Exercise Price
$12.54 to $16.51
0.5 $14.63 1.50.5 $14.63 
$16.52 to $18.97
1.8 $18.47 9.40.3 $18.28 
$18.98 to $25.13
2.6 $21.09 4.81.9 $20.57 
$25.14 to $37.94
1.9 $31.39 4.91.7 $31.94 
$37.95 to $48.52
0.6 $43.06 6.60.3 $44.58 
Summary Information of Unvested RSUs and PSUs Activity
The following summarizes information on unvested RSU and PSU activity related to the Company’s employees and non-employee directors (in millions; except weighted average grant-date fair value):
Number of
RSUs/PSUs		Weighted Average
Grant-Date Fair Value
Unvested at December 31, 20211.7 $26.82 
Granted0.6 $47.80 
Vested(0.5)$24.85 
Forfeited(0.3)$33.62 
Unvested at December 31, 20221.5 $34.85 
Granted1.0 $39.93 
Vested(0.6)$30.93 
Forfeited(0.2)$39.44 
Unvested at December 31, 20231.7 $38.56 
Granted2.2 $21.07 
Vested(0.7)$33.87 
Forfeited(0.3)$30.45 
Unvested at December 31, 20242.9 $27.37