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Debt (Schedule of Current Senior Notes Outstanding) (Details) - Senior Notes | Jun. 30, 2020 USD ($) | Jun. 30, 2020 EUR (€) | Apr. 14, 2020 USD ($) | Apr. 10, 2020 | Apr. 02, 2020 USD ($)
--- | --- | --- | --- | --- | ---
2023 Series A Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |
Coupon Rate | 3.94% | 3.94% |  |  |
2025 Series B Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |
Coupon Rate | 4.04% | 4.04% |  |  |
2026 Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |
Coupon Rate | 3.72% | 3.72% |  |  |
2021 Series A Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 50,000,000 |  |  |  |
Coupon Rate | 3.32% | 3.32% |  |  |
2024 Series B Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |
Coupon Rate | 3.76% | 3.76% |  |  |
2025 Series C Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | € |  | € 88,857,000 |  |  |
Coupon Rate | 1.785% | 1.785% |  |  |
2022 Series A Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |
Coupon Rate | 3.25% | 3.25% |  |  |
2027 Series B Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |
Coupon Rate | 3.72% | 3.72% |  |  |
2029 Series C Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 100,000,000 |  |  |  |
Coupon Rate | 4.19% | 4.19% |  |  |
MetLife 2030 Series D Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 125,000,000 |  |  |  | $ 125,000,000
Coupon Rate | 2.50% | 2.50% |  |  | 2.50%
Prudential 2030 Series D Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 75,000,000 |  | $ 75,000,000 |  |
Coupon Rate | 2.50% | 2.50% |  | 2.50% |

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