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Summary of Significant Accounting Policies - Other Income (Details) - British Petroleum $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2018 claim | Jun. 30, 2018 USD ($)
Loss Contingencies [Line Items] |  |
Number of claims settled | claim | 2 |
Gain related to settlement agreements | $ |  | $ 4.0

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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=118942415&loc=d3e14326-108349 + Details
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- Definition The number of claims settled and dismissed during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349 + Details
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