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Notes Payable and Unsecured Credit Facilities Narrative (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Sep. 02, 2020 | Sep. 30, 2020 | May 11, 2020
Debt Instrument [Line Items] |  |  |
Line of credit total borrowing capacity |  | $ 1,200.0 |
Senior Notes [Member] | Notes Due June 2030 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | $ 600.0
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.70%
Debt Instrument, Discount Percent |  |  | 99.805%
Notes Payable to Banks [Member] | Notes Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% |  |
Debt instrument redemption amount | $ 300.0 |  |
Expected Proceeds from redemption of debt | 325.1 |  |
Accrued interest paid | $ 25.1 |  |

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