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Debt - Unsecured Credit Facility (Details) - Unsecured credit facility - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jan. 31, 2019 | Dec. 31, 2017
Line of Credit Facility [Line Items] |  |  |
Face amount | $ 500,000,000 |  |
Short-term borrowing | $ 250,000,000 |  | $ 0
Number of increases to margin | 2 |  |
Percentage increase to margin | 0.50% |  |
Interest rate on outstanding borrowings | 6.01% |  |
LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Applicable margin on variable rate | 3.50% |  |
Base Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Applicable margin on variable rate | 2.50% |  |
Subsequent Event |  |  |
Line of Credit Facility [Line Items] |  |  |
Short-term borrowing |  | $ 250,000,000 |

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