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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Fair Value of Financial Instruments [Line Items]    
Notes payable, fixed interest rate 3.50% 4.40%
Notes payable, aggregate fair value $ 977.8 $ 927.0
Notes payable, principal balance 948.1 $ 910.2
Interest Rate Swap    
Fair Value of Financial Instruments [Line Items]    
Fair value of derivative liability $ 0.4