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Debt and Credit Facilities (Credit Facilities) (Details) - Letter of Credit	Jun. 21, 2019 USD ($)	Mar. 22, 2019 USD ($)	Mar. 07, 2019 USD ($)	Nov. 23, 2015 USD ($)
Credit Suisse (Switzerland) Ltd.
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 125,000,000
Ratio of indebtedness to net capital		0.35
Minimum net worth required for compliance		$ 3,000,000,000.0
Wells Fargo
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 25,000,000
Bank Of Montreal, CEP and ING Bank N.V., London Branch
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 255,000,000.0	$ 180,000,000.0

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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

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)(a)
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998

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Indebtedness divided by net capital.

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