XML 66 R50.htm IDEA: XBRL DOCUMENT
v3.20.4

Dividends and Distributions Payable - Federal Income Tax (Details) - $ / shares | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Dividends Payable [Line Items] |  |  |
Dividends Payable, Amount Per Share | $ 2.405 | $ 2.280 | $ 2.155
Dividend Declared, Ordinary Income [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Dividends Payable, Amount Per Share | 1.928 | 1.933 | 1.638
Dividend Declared, Return of Capital [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Dividends Payable, Amount Per Share | $ 0.477 | $ 0.347 | $ 0.517

X
- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
Name: | us-gaap_DividendsPayableAmountPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
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_DividendsPayableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DividendsAxis=adc_DividendDeclaredOrdinaryIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DividendsAxis=adc_DividendDeclaredReturnOfCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |