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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 11, 2018 | Mar. 31, 2018 | Mar. 09, 2018 | Mar. 06, 2018 | Dec. 07, 2015
Dividends Payable [Line Items] |  |  |  |  |
Quarterly cash dividend declared |  | $ 0.15 |  |  |
Dividend declared date |  | Mar. 06, 2018 |  |  |
Dividend record date |  | Mar. 29, 2018 |  |  |
Dividend paid date |  | Apr. 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 |  | $ 245.0 |  |  |
Subsequent Event [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Dividends paid | $ 7.5 |  |  |  |
Accelerated Stock Repurchase Agreement [Member] |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Accelerated Share Repurchases Payment |  |  | $ (50.0) |  |
Initial ASR share delivery |  |  | 1.3 |  |
ASR Repurchase, Common, Percent of Expected Shares |  |  | 80.00% |  |

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