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Common Stock and Stock-Based Awards Plans - Dividends and Share Repurchase Authorization (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 14, 2020 | Sep. 30, 2020 | Feb. 19, 2020 | Oct. 26, 2018 | Mar. 06, 2018
Dividends Payable [Line Items] |  |  |  |  |
Quarterly cash dividend declared |  | $ 0.16 |  |  |
Dividend declared date |  | Sep. 11, 2020 |  |  |
Dividend record date |  | Sep. 30, 2020 |  |  |
Dividends paid |  | $ 17.2 |  |  |
Dividend paid date |  | Oct. 14, 2020 |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Repurchase of common shares program authorized amount |  |  | $ 150.0 | $ 100.0 | $ 250.0
Repurchase of common shares remaining authorized amount |  | $ 210.1 |  |  |
Subsequent Event [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Dividends paid | $ 5.8 |  |  |  |
Accelerated Stock Repurchase Agreement [Member] |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Repurchase of common shares, value |  | $ 19.3 |  |  |
Repurchase of common Shares |  | 0.7 |  |  |
Repurchase of common shares, average cost per share |  | $ 26.69 |  |  |

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