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Note 13. Common Stock and Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Repurchase Agreements Share repurchase activity under this program was as follows:
Shares RepurchasedRemaining Authorization to Repurchase
PeriodNumber of sharesCost
(in millions)		Cost
(in millions)
September 9, 2021 Authorization$250.0 
September 9, 2021 through September 30, 2021— $— $250.0 
October 1, 2021 through December 31, 20215,155,491 151.9 $98.1 
January 1, 2022 through March 31, 2022— — $98.1 
April 1, 2022 through June 30, 20221,760,462 50.3 $47.8 (1)
July 1, 2022 through September 30, 2022610,000 14.1 $33.7 
October 1, 2022 through December 31, 2022427,383 12.4 $21.3 
Total7,953,336 $228.7 
(1) Share repurchases during the second quarter of 2022 included 760,602 shares at a cost of $25.0 million representing the final settlement of the ASR, which was funded in December 2021 but a portion of which remained outstanding as of December 31, 2021.
Schedule of Stock Options Roll Forward
Number of SharesWeighted Average Grant-Date Fair Value per AwardWeighted Average Remaining Contractual Terms (Years)Aggregate Intrinsic Value
(in millions)
Options outstanding at December 31, 2022
300,000 $5.26 
Granted— $— 
Exercised— $— 
Cancelled— $— 
Options outstanding and exercisable at December 31, 2023
300,000 $5.26 6.1$1.5 
Share-Based Payment Arrangement, Restricted Stock Unit, Activity
Number of Restricted Stock Units
Weighted Average Grant-Date
Fair Value per Award
Restricted stock units outstanding at December 31, 2022
1,740,166 $23.20 
Granted636,258 $21.63 
Vested(645,604)$23.09 
Forfeited(84,249)$24.05 
Restricted stock units outstanding at December 31, 2023
1,646,571 $22.60 
Share-based Payment Arrangement, Performance Shares, Activity [Table Text Block]
Number of Performance Units
Weighted Average Grant-Date
Fair Value per Award
Performance units outstanding at December 31, 2022
921,391 $25.56 
Granted284,061 $27.72 
Performance adjustment (1)
(27,299)$20.05 
Vested (2)
(412,827)$24.71 
Forfeited(18,112)$28.23 
Performance units outstanding at December 31, 2023
747,214 $29.41 
(1) For the 2020-2022 performance period, performance adjustment includes 221,509 performance units for return on equity, for which actual performance was below the minimum established threshold and thus resulted in no payout, and is net of 194,210 additional performance units for relative total shareholder return, for which actual performance resulted in a payout of 200% of target.
(2) Includes 194,210 performance units for the 2020-2022 performance period for relative total shareholder return that were paid out at 200% of target based on actual performance achieved.
Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option
Number of Restricted Stock Awards
Weighted Average Grant-Date
Fair Value per Award
Restricted stock awards outstanding at December 31, 2022
655,050 $21.07 
Granted22,937 $21.32 
Vested(94,630)$20.91 
Forfeited(31,117)$25.93 
Restricted stock awards outstanding at December 31, 2023 (1)
552,240 $20.84