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Debt (Senior Notes and Mortgage Notes Payable) (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 08, 2017
Nov. 30, 2020
Oct. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 07, 2020
Nov. 08, 2017
Debt Instrument [Line Items]                
Debt restructuring costs       $ 18,036,000 $ 1,523,000 $ 605,000    
Deferred finance costs, net       $ 6,034,000 $ 8,033,000      
Lenexa Mortgage                
Debt Instrument [Line Items]                
Aggregate principal amount $ 1,900,000              
Interest rate 4.10%              
Periodic payment $ 1,600,000              
Extinguishment of debt   $ 1,700,000            
Term Loan D                
Debt Instrument [Line Items]                
Current borrowing capacity     $ 250,000,000          
Credit facility maximum borrowing capacity     500,000,000          
Accordion feature     $ 250,000,000          
Term Loan D | LIBOR                
Debt Instrument [Line Items]                
Floor over LIBOR     0.25%          
Term Loan D | LIBOR | Minimum                
Debt Instrument [Line Items]                
Debt instrument spread on variable interest rate     1.20%          
Term Loan D | LIBOR | Maximum                
Debt Instrument [Line Items]                
Debt instrument spread on variable interest rate     1.80%          
Term Loan D | Base Rate | Minimum                
Debt Instrument [Line Items]                
Debt instrument spread on variable interest rate     0.20%          
Term Loan D | Base Rate | Maximum                
Debt Instrument [Line Items]                
Debt instrument spread on variable interest rate     0.80%          
Unsecured Credit Facility                
Debt Instrument [Line Items]                
Current borrowing capacity     $ 1,700,000,000          
Credit facility maximum borrowing capacity     $ 1,950,000,000          
Operating Partnership and QTS Finance Corporation | Senior Notes                
Debt Instrument [Line Items]                
Aggregate principal amount               $ 400,000,000
Interest rate       4.75%       4.75%
Percentage of issued price equal to face value               100.00%
Debt restructuring costs       $ 18,000,000.0        
Operating Partnership and QTS Finance Corporation | Senior Notes | Early Redemption Fees                
Debt Instrument [Line Items]                
Debt restructuring costs       14,300,000        
Operating Partnership and QTS Finance Corporation | Senior Notes | Non-cash Charge                
Debt Instrument [Line Items]                
Debt restructuring costs       $ 3,700,000        
5.875% Senior Notes due 2022 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate               5.875%
Senior Notes due 2028                
Debt Instrument [Line Items]                
Aggregate principal amount             $ 500,000,000  
Interest rate       3.875%     3.875%  
Percentage of issued price equal to face value             100.00%  
Senior Notes due 2028 | Senior Notes                
Debt Instrument [Line Items]                
Deferred finance costs, net       $ 7,500,000