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Legal Proceedings Gain Contingencies (Details) - Positive Outcome of Litigation - USD ($) $ in Millions | Sep. 10, 2018 | May 22, 2018
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Gain Contingencies [Line Items] |  |
Gain Contingency, Unrecorded Amount |  | $ 16.3
Sparta Fraud Claim Gain Contingency |  |
Gain Contingencies [Line Items] |  |
Gain Contingency, Unrecorded Amount | $ 6.3 | $ 4.7
Sparta Professional Negligence Claim Gain Contingency |  |
Gain Contingencies [Line Items] |  |
Gain Contingency, Unrecorded Amount | $ 9.1 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355 + Details
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