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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 ($) | Nov. 23, 2015 USD ($)
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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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