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Notes Payable (Scheduled Repayments On Outstanding Debt) (Details)
$ in Millions
Mar. 31, 2018
USD ($)
2018 $ 174.1
2019 643.0
2020 (1.2) [1]
2021 249.1
2022 349.3
Thereafter 790.6
Total notes payable $ 2,204.9 [2]
Weighted Average Interest Rate 4.30% [2]
Maturities Due In 2018 [Member]  
Weighted Average Interest Rate 2.20%
Maturities Due In 2019 [Member]  
Weighted Average Interest Rate 5.40%
Maturities Due In 2020 [Member]  
Weighted Average Interest Rate 0.00% [1]
Maturities due in 2021 [Member]  
Weighted Average Interest Rate 4.80%
Maturities due in 2022 [Member]  
Weighted Average Interest Rate 3.20%
Maturities Due Thereafter [Member]  
Weighted Average Interest Rate 4.40%
[1] Includes amortization of debt discounts and debt issuance costs, net of scheduled principal payments.
[2] Includes all available extension options.