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Debt - Narrative (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) instrument extension | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |
Number of lines of unsecured credit (in instruments) | instrument | 2 |
Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized discount (premium), net | $ 7,000,000 | $ 5,200,000
Unamortized debt issuance expense | 19,300,000 | 18,100,000
Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity | 1,240,000,000 |
Line of Credit [Member] | Unsecured Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance expense | 4,200,000 | 3,200,000
Unsecured Line of Credit [Member] | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity | $ 1,200,000,000 |
Number of extension options (in extensions) | extension | 1 |
Extension period (in months) | 18 months |
Unsecured Line of Credit [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.875% |
Unsecured Line of Credit [Member] | Line of Credit Working Capital [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity | $ 35,000,000 |
Unsecured Line of Credit [Member] | Line of Credit Working Capital [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.875% |
Mortgage notes payable, net [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized discount (premium), net | $ (21,200,000) | (33,200,000)
Unamortized debt issuance expense | $ 4,400,000 | $ 5,400,000

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