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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
CARRYING VALUE    
Derivative [Line Items]    
Notes and bonds payable $ 5,227.4 $ 5,351.8
Real estate notes receivable 155.0 99.6
FAIR VALUE    
Derivative [Line Items]    
Notes and bonds payable 4,941.2 5,149.6
Real estate notes receivable $ 151.7 $ 99.6