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Financial Statement Presentation Care Act (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2020 USD ($) Rate
Presentation of Financial Statements [Abstract] |
Federal Tax Deferred (Cares Act) | $ | $ 31.1
Percent of Federal Tax Deferred (Cares Act) | Rate | 50.00%

X
- Definition Federal Payroll Tax Deferred (Cares Act) + References No definition available. + Details
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Namespace Prefix: | asgn_
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Period Type: | duration

X
- Definition Percent of Federal Tax Deferred ( Cares Act) + References No definition available. + Details
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Namespace Prefix: | asgn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Presentation of Financial Statements [Abstract] + References No definition available. + Details
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Namespace Prefix: | asgn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration