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Investments in Unconsolidated Entities - Narrative (Details)
$ in Millions
1 Months Ended
Sep. 30, 2014
USD ($)
ft²
Mar. 31, 2020
USD ($)
Jun. 30, 2018
ft²
Schedule of Equity Method Investments [Line Items]      
Escrow holdback deposit   $ 13.3  
Heritage Common X      
Schedule of Equity Method Investments [Line Items]      
Area of real estate property (in sqft) | ft²     200,000
Escrow holdback deposit   $ 0.4  
Digital Realty Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Area of real estate property (in sqft) | ft² 132,300    
Equity method investment, ownership (percent) 80.00%    
Payments to acquire interest in equity method investment $ 68.4    
Equity method investment, property 187.5    
Equity method investment, liabilities $ 102.0    
Operating leases, term of contract 3 years    
Mercedes-Benz Financial Services USA | Heritage Common X      
Schedule of Equity Method Investments [Line Items]      
Portion of building leased out (percent)   100.00%