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Notes Payable and Unsecured Credit Facilities Narrative (Details) ratio in Millions, $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Apr. 02, 2018 USD ($) | Mar. 09, 2018 USD ($)
Debt Instrument [Line Items] |  |  |
Repayments of Lines of Credit | $ 60.0 |  |
Senior Notes [Member] | Notes Due March 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | $ 300.0
Debt Instrument, Interest Rate, Stated Percentage |  |  | 0.00%
Debt Instrument, Discount Percent |  |  | 0.0
Senior Notes [Member] | Notes Due June 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  | $ 150.0 |
Debt Instrument, Interest Rate, Stated Percentage |  | 0.00% |
Notes Payable to Banks [Member] | 150M 6% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Unsecured Debt | 163.2 |  |
Accordion Feature [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Increase in Capacity | 1,250.0 |  |
Mortgage Loan Maturities [Member] | Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 129.6 |  |

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