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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 11, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Oct. 26, 2018 | Jul. 18, 2018 | Mar. 09, 2018 | Mar. 06, 2018 | Dec. 07, 2015
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Quarterly cash dividend declared |  | $ 0.15 |  |  |  |  |  |
Dividend declared date |  | Sep. 17, 2018 |  |  |  |  |  |
Dividend record date |  | Sep. 28, 2018 |  |  |  |  |  |
Dividends paid |  |  | $ 14.2 |  |  |  |  |
Dividend paid date |  | Oct. 11, 2018 |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Repurchase of common shares program authorized amount |  |  |  |  |  |  | $ 250.0 | $ 100.0
Repurchase of common shares remaining authorized amount |  | $ 191.4 | $ 191.4 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividends paid | $ 6.8 |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Repurchase of common shares program authorized amount |  |  |  | $ 100.0 |  |  |  |
Accelerated Stock Repurchase Agreement [Member] |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Accelerated Share Repurchases Payment |  |  |  |  |  | $ (50.0) |  |
ASR share delivery |  |  |  |  | 0.4 | 1.3 |  |

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