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Commitments and Contingencies (Narratives) (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) claim case | Dec. 31, 2017 USD ($)
Loss contingency |  |
Accrued liability for the outcomes of non-income based tax audits | $ | $ 3.2 | $ 1.7
Indemnification liability | $ | $ 1.6 | $ 1.6
Loss Contingencies [Line Items] |  |
Number of cases settled | 3 |
Number of cases appealed | 3 |
Number of pending cases | case | 2 |
Similar Judge |  |
Loss Contingencies [Line Items] |  |
Number of cases settled | 2 |

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