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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 11, 2019 | Mar. 31, 2019 | Oct. 26, 2018 | Mar. 06, 2018
Dividends Payable [Line Items] |  |  |  |
Quarterly cash dividend declared |  | $ 0.15 |  |
Dividend declared date |  | Mar. 15, 2019 |  |
Dividend record date |  | Mar. 29, 2019 |  |
Dividends paid |  | $ 6.2 |  |
Dividend paid date |  | Apr. 11, 2019 |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Repurchase of common shares program authorized amount |  |  | $ 100.0 | $ 250.0
Repurchase of common shares remaining authorized amount |  | $ 140.5 |  |
Subsequent Event [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends paid | $ 5.9 |  |  |

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