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Debt Debt (Schedule of Current Senior Notes Outstanding) (Details) - Senior Notes | Apr. 14, 2020 USD ($) | Apr. 10, 2020 | Apr. 02, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 EUR (€)
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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%
Subsequent Event | MetLife 2030 Series D Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount |  |  | $ 125,000,000 |  |
Coupon Rate |  |  | 2.50% |  |
Subsequent Event | Prudential 2030 Series D Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |
Coupon Rate | 2.50% | 2.50% |  |  |

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