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Stockholders' Equity (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | Jan. 26, 2023 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury stock, shares |  | 6.3 | 6.3
Treasury stock, Cost basis |  | $ 227.8 | $ 236.7
2018 Stock Buyback Program [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of shares authorized for repurchase | 4.3 |  |
Stock repurchase expiration date | Dec. 31, 2024 |  |
Restricted Stock [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of shares nonvested |  | 0.3 | 0.3

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