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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 22, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury stock shares |  | 6,200,000 |  | 6,200,000 |  | 5,100,000
Treasury stock, Cost basis |  | $ 233.8 |  | $ 233.8 |  | $ 175.8
Shares repurchased |  | 50,000 | 56,349 | 1,204,368 | 56,349 |
Accelerated Share Repurchase Agreement | Common Stock [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased |  |  |  | 1,654,244 |  |
Shares purchased average cost per share |  |  |  | $ 48.77 |  |
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, 2022 |  |  |  |  |
2018 Stock Buyback Program [Member] | Common Stock [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased |  |  |  | 1,204,368 |  |
Shares purchased average cost per share |  |  |  | $ 48.90 |  |
Restricted Stock [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Number of shares nonvested |  | 1,000,000.0 |  | 1,000,000.0 |  | 1,100,000

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