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Financial Instruments and Fair Value Measurements - Summary or Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Carrying value |  |
Fair value of financial assets and liabilities |  |
Mortgages payable assumed in connection with acquisitions | $ 406.7 | $ 408.4
Notes and bonds payable | 6,041.2 | 6,317.6
Estimated fair value |  |
Fair value of financial assets and liabilities |  |
Mortgages payable assumed in connection with acquisitions | 410.3 | 417.7
Notes and bonds payable | 6,008.4 | 6,826.1
Mortgages Payable |  |
Fair value of financial assets and liabilities |  |
Unamortized balance of non-cash net premiums | 2.6 | 3.0
Remaining balance of deferred financing costs at period end | 1.2 | 1.3
Notes and bonds payable |  |
Fair value of financial assets and liabilities |  |
Unamortized balance of non-cash net premiums | 6.2 | 6.3
Remaining balance of deferred financing costs at period end | $ 34.3 | $ 35.9

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