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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 26, 2023 | Sep. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury stock, shares |  | 6,500,000 | 6,500,000 | 6,300,000
Treasury stock, Cost basis |  | $ 255.1 | $ 255.1 | $ 236.7
Shares repurchased |  | 300,000 | 612,993 |
Excise tax |  |  | $ 0.2 |
2018 Stock Buyback Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of shares authorized for repurchase | 4,300,000 |  |  |
Stock repurchase expiration date | Dec. 31, 2024 |  |  |
2018 Stock Buyback Program [Member] | Common Stock [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased |  |  | 612,913 | 0
Shares purchased average cost per share |  |  | $ 48.63 |
Restricted Stock [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of shares nonvested |  | 300,000 | 300,000 | 300,000

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