Fair Value of Financial Instruments - Fair Value, by Balance Sheet Grouping (Details) - Significant Unobservable Inputs Level 3 - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Mortgage notes payable | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	$ 1,500.0	$ 1,400.0
Revolving Credit Facility | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	167.9	111.1
Revolving Credit Facility | Carrying Value | Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	293.5	303.0
Revolving Credit Facility | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	168.0	111.2
Revolving Credit Facility | Fair Value | Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	293.0	304.6
Senior Notes | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	500.0	500.0
Senior Notes | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	$ 495.0	$ 512.4