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Leases - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Leased Assets [Line Items] |  |  |
Option to extend lease term | 7 years |  |
Option to terminate lease term | 1 year |  |
Operating lease expense | $ 77.7 |  |
Rental expense |  | $ 89.4 | $ 87.5
Operating leases, not yet commenced, amount | $ 45.5 |  |
Minimum |  |  |
Operating Leased Assets [Line Items] |  |  |
Remaining lease term | 1 year |  |
Operating lease, not yet commenced, amount | 1 year |  |
Maximum |  |  |
Operating Leased Assets [Line Items] |  |  |
Remaining lease term | 10 years |  |
Operating lease, not yet commenced, amount | 8 years |  |

X
- Definition Lessee, Operating Lease, Lease Not Yet Commenced, Liability + References No definition available. + Details
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Namespace Prefix: | rhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Lessee, Operating Lease, Remaining Lease Term + References No definition available. + Details
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- Definition Lessee, Operating Lease, Termination Period + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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X
- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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X
- Definition Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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X
- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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
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- Details
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- Details
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