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Fair Value Measurements (Details Textual) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative [Line Items] |  |
Derivative Liability, Fixed Rate Debt, Carrying Value | $ 386.3 | $ 386.9
Derivative Liability, Fixed Rate Debt, Fair Value | 400.3 | 401.4
Derivative Liability, Variable Rate Debt, Fair Value | $ 29.0 | $ 14.0

X
- Definition Its represents the carrying value of fixed rate debt. + References No definition available. + Details
Name: | adc_DerivativeLiabilityFixedRateDebtCarryingValue
Namespace Prefix: | adc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Its represents the fair value of fixed rate debt. + References No definition available. + Details
Name: | adc_DerivativeLiabilityFixedRateDebtFairValue
Namespace Prefix: | adc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Its represents the fair value of variable rate debt. + References No definition available. + Details
Name: | adc_DerivativeLiabilityVariableRateDebtFairValue
Namespace Prefix: | adc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration