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Debt (Narrative) (Details) |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Apr. 14, 2020 USD ($) | Dec. 04, 2015 USD ($) | Dec. 19, 2014 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 EUR (€) | Apr. 10, 2020 USD ($) | Apr. 02, 2020 USD ($) | Mar. 23, 2020 USD ($) | Mar. 22, 2020 USD ($) | Mar. 14, 2019 USD ($) | Dec. 31, 2015 EUR (€) | Sep. 30, 2014 USD ($) | Jul. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding credit facility balance |  |  |  | $ 0 | $ 288,765,000 |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  | $ 32,400,000 | 29,700,000 | $ 34,700,000 |  |  |  |  |  |  |  |  |  |
Prudential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  |  | $ 425,000,000 |  |  |  |  |  |  |  |
MetLife |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  |  |  |  | $ 300,000,000 | $ 150,000,000 |  |  |  |  |
Prime Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit spread during period |  |  |  | 0.375% |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio under credit facility & note payable, maximum |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term | 3 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity | $ 1,000,000,000 | $ 850,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accordion feature, increase limit | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accordion feature, higher borrowing capacity option | 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Individual Borrowings | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Individual Borrowings | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 180 days |  |  |  |  |  |  |  |  |  |  |  |
Amended And Restated Unsecured Short Term Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding credit facility balance |  |  |  | $ 0 | $ 288,800,000 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.50% |  |  | 2.50% |  |  |  |  |  |  |  |  |
Credit Facility weighted average interest rates on outstanding balance |  |  |  |  | 2.78% |  |  |  |  |  |  |  |  |  |  |
Reduction of credit facility availability |  |  |  | $ 1,400,000 | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio under credit facility & note payable, maximum |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |
Amended And Restated Unsecured Short Term Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fees |  |  |  | 0.20% |  |  |  |  |  |  |  |  |  |  |  |
Amended And Restated Unsecured Short Term Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fees |  |  |  | 0.375% |  |  |  |  |  |  |  |  |  |  |  |
Amended And Restated Unsecured Short Term Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 1.00% |  |  | 1.00% |  |  |  |  |  |  |  |  |
Credit spread during period |  |  |  | 1.375% |  |  |  |  |  |  |  |  |  |  |  |
Amended And Restated Unsecured Short Term Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit spread during period |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
Amended And Restated Unsecured Short Term Revolving Credit Facility | Prime Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.00% |  |  | 2.00% |  |  |  |  |  |  |  |  |
Amended And Restated Unsecured Short Term Revolving Credit Facility | Prime Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit spread during period |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
2023 Series A Notes and 2025 Series B Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000
2023 Series A Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 3.94% |  |  | 3.94% |  |  |  |  |  |  |  |  | 3.94%
Principal Amount |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000
2025 Series B Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.04% |  |  | 4.04% |  |  |  |  |  |  |  |  | 4.04%
Principal Amount |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000
2026 Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 3.72% |  |  | 3.72% |  |  |  |  |  |  | 3.72% |  |
Principal Amount |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  | $ 75,000,000 |  |
2021 Series A Notes and 2024 Series B Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |
2021 Series A Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 3.32% |  |  | 3.32% |  |  |  |  |  |  |  | 3.32% |
Principal Amount |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
2024 Series B Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 3.76% |  |  | 3.76% |  |  |  |  |  |  |  | 3.76% |
Principal Amount |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |
2025 Series C Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 1.785% |  |  | 1.785% |  |  |  |  |  | 1.785% |  |  |
Principal Amount | € |  |  |  |  |  |  | € 88,857,000 |  |  |  |  |  | € 88,900,000 |  |  |
Prudential 2030 Series D Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.50% |  |  | 2.50% | 2.50% |  |  |  |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2022 Series A Notes and 2027 Series B Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2022 Series A Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.25% | 3.25% |  |  | 3.25% |  |  |  |  |  |  |  |  |
Principal Amount |  |  | $ 75,000,000 | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2027 Series B Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.72% | 3.72% |  |  | 3.72% |  |  |  |  |  |  |  |  |
Principal Amount |  |  | $ 75,000,000 | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2029 Series C Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.19% |  |  | 4.19% |  |  |  |  | 4.19% |  |  |  |
Principal Amount |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |
MetLife 2030 Series D Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.50% |  |  | 2.50% |  | 2.50% |  |  |  |  |  |  |
Principal Amount |  |  |  | $ 125,000,000 |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |

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