Properties, Net (Details 4) - Disposed of by sale - Single-tenant data centers $ in Millions  | 
 Jun. 20, 2019  
USD ($)  
property 
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| Investments in real estate | |
| Ownership percentage sold | 90.00% | 
| Proceeds from Divestiture of Businesses | $ 238.5 | 
| Data Center Shells | |
| Investments in real estate | |
| Ownership percentage sold | 90.00% | 
| Number of real estate properties | property | 7 | 
| Consideration received from sale of ownership interest | $ 265.0 | 
| Gain on sale of ownership interest | $ 84.5 | 
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- Definition Ownership Percentage Sold No definition available. 
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- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. No definition available. 
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- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition The number of real estate properties owned as of the balance sheet date. No definition available. 
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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