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Incentive Plan (Performance Based Awards) (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
simulation
Mar. 31, 2014
Dec. 31, 2014
2014 Performance Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 0.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
   
Award vesting period 3 years    
Number of trials 100,000dlr_SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsMethodsUsedNumberofSimulations
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
   
Expected volatility rate 33.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
   
Risk-free interest rate 0.67%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
   
Fair value of awards $ 30.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
   
Requisite service period of share-based award 4 years    
Unearned compensation 21.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
  9.5us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
Recognized compensation expense 1.2us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
0.4us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
 
Capitalized expense related to construction and leasing activities $ 0.4us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
$ 0.2us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
 
2014 Performance Grant | Class D Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of awards to executive officers and other employees (shares/units) 1,019,952us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= dlr_ClassDUnitsMember
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
   
2014 Performance Grant | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of awards to executive officers and other employees (shares/units) 368,878us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
   
2014 Performance Grant | Share-based Compensation Award, Tranche Four      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
/ us-gaap_VestingAxis
= dlr_ShareBasedCompensationAwardTrancheFourMember
   
2014 Performance Grant | Share-based Compensation Award, Tranche Fifth      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= dlr_TwoThousandFourteenPerformanceGrantMember
/ us-gaap_VestingAxis
= dlr_ShareBasedCompensationAwardTrancheFifthMember
   
2015 Performance Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility rate 24.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= dlr_A2015PerformanceGrantMember
   
Risk-free interest rate 1.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= dlr_A2015PerformanceGrantMember