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Commitments and Contingencies - Bonds (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018
Commitments and Contingencies |  |
Gain on the claim settlement | $ 4.0 |
Surety | Minimum |  |
Surety |  |
Percentage of business which has required bonds |  | 20.00%
Surety | Maximum |  |
Surety |  |
Percentage of business which has required bonds |  | 30.00%

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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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