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Fair Value Measurements (Details Textual) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative Liability, Fixed Rate Debt, Carrying Value	$ 505.6	$ 386.9
Derivative Liability, Fixed Rate Debt, Fair Value	516.5	401.4
Derivative Liability, Variable Rate Debt, Fair Value	$ 14.0	$ 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