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Legal Proceedings Gain Contingencies (Details) - Positive Outcome of Litigation - USD ($) $ in Millions	Sep. 10, 2018	May 22, 2018
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.

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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

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