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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Dec. 10, 2025 | Dec. 09, 2024 | Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Treasury stock, shares |  |  | 11,800,000 |  | 10,700,000
Treasury stock, Cost basis |  |  | $ 591.1 |  | $ 502.9
Shares repurchased |  |  | 1,400,000 | 350,000 |
Excise tax |  |  | $ 0.8 |  |
2018 Stock Buyback Program [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Percentage of shares authorized to be repurchased | 5.00% | 5.00% |  |  |
Number of shares authorized for repurchase | 4,100,000 | 4,300,000 |  |  |
Stock repurchase expiration date | Dec. 31, 2026 | Dec. 31, 2026 |  |  |
Shares repurchased |  |  | 1.4 | 350,000 |
2018 Stock Buyback Program [Member] | Common Stock [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Shares purchased average cost per share |  |  | $ 67.58 | $ 59.28 |
Restricted Stock [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of shares nonvested |  |  | 7,280 |  | 8,520

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