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Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Goodwill [Roll Forward] |  |
Goodwill | $ 1,215.0 | $ 1,225.8
Jefferson Wells |  |
Goodwill [Roll Forward] |  |
Goodwill | 55.5 |
Right Management |  |
Goodwill [Roll Forward] |  |
Goodwill | 62.1 |
Americas | United States |  |
Goodwill [Roll Forward] |  |
Goodwill | 493.1 | 490.2
Americas | United States | Jefferson Wells |  |
Goodwill [Roll Forward] |  |
Goodwill | 548.6 | 545.7
Southern Europe | France |  |
Goodwill [Roll Forward] |  |
Goodwill | 70.4 | 73.3
Southern Europe | Italy |  |
Goodwill [Roll Forward] |  |
Goodwill | $ 4.0 | $ 4.2

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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