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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
Total
Common Stock [Member]
Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance, shares at Dec. 31, 2022   12,756,885      
Common stock repurchased, shares (305,493) (305,493)      
Restricted stock units converted to common stock, shares   101,757      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   13,070      
Balance, shares at Sep. 30, 2023   12,566,219      
Balance at Dec. 31, 2022 $ 1,624,000,000 $ 100,000 $ 245,700,000 $ 1,381,100,000 $ (2,900,000)
Net income 192,500,000 0 0 192,500,000 0
Stock-based compensation 29,000,000.0 0 29,000,000.0 0 0
Common stock repurchased, value (149,000,000.0) [1] 0 (7,800,000) (141,200,000) 0
Stock Issued During Period, Value, Stock Options Exercised 4,400,000   4,400,000    
Balance at Sep. 30, 2023 $ 1,700,900,000 $ 100,000 271,300,000 1,432,400,000 (2,900,000)
Balance, shares at Jun. 30, 2023   12,821,681      
Common stock repurchased, shares (256,232) (256,232)      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   770      
Balance, shares at Sep. 30, 2023   12,566,219      
Balance at Jun. 30, 2023 $ 1,747,000,000 $ 100,000 261,700,000 1,487,900,000 (2,700,000)
Net income 70,800,000 0 0 70,800,000 0
Other comprehensive income (200,000) 0 0 0 (200,000)
Stock-based compensation 9,300,000 0 9,300,000 0 0
Common stock repurchased, value (126,300,000) [1] 0 0 (126,300,000) 0
Stock Issued During Period, Value, Stock Options Exercised 300,000   300,000    
Balance at Sep. 30, 2023 $ 1,700,900,000 $ 100,000 271,300,000 1,432,400,000 (2,900,000)
Balance, shares at Dec. 31, 2023 12,522,397 12,522,397      
Common stock repurchased, shares (462,131) (462,131)      
Restricted stock units converted to common stock, shares   8,908      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   42,426      
Balance, shares at Sep. 30, 2024 12,111,600 12,111,600      
Balance at Dec. 31, 2023 $ 1,753,700,000 $ 100,000 279,000,000.0 1,475,600,000 (1,000,000.0)
Net income 96,000,000.0 0 0 96,000,000.0 0
Other comprehensive income 1,900,000 0 0 0 1,900,000
Stock-based compensation 32,200,000 0 32,200,000 0 0
Common stock repurchased, value (251,900,000) [1] 0 (1,300,000) (250,600,000) 0
Stock Issued During Period, Value, Stock Options Exercised 14,600,000   14,600,000    
Balance at Sep. 30, 2024 $ 1,646,500,000 $ 100,000 324,500,000 1,321,000,000 900,000
Balance, shares at Jun. 30, 2024   12,111,128      
Common stock repurchased, shares (86) (86)      
Restricted stock units converted to common stock, shares   558      
Balance, shares at Sep. 30, 2024 12,111,600 12,111,600      
Balance at Jun. 30, 2024 $ 1,554,900,000 $ 100,000 313,800,000 1,242,200,000 (1,200,000)
Net income 78,800,000 0 0 78,800,000 0
Other comprehensive income 2,100,000 0 0 0 2,100,000
Stock-based compensation 10,700,000 0 10,700,000 0 0
Common stock repurchased, value 0 [1] 0 0 0 0
Balance at Sep. 30, 2024 $ 1,646,500,000 $ 100,000 $ 324,500,000 $ 1,321,000,000 $ 900,000
[1] Total cost of repurchases includes excise tax.