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Segment Disclosures - Segment Revenue Per Service (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2019 | Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 30, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 29, 2019 | Dec. 30, 2018 | Dec. 31, 2017
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from services | $ 1,337.8 | $ 1,267.7 | $ 1,367.5 | $ 1,382.6 | $ 1,414.7 | $ 1,342.4 | $ 1,386.9 | $ 1,369.9 | $ 5,355.6 | $ 5,513.9 |
Service |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from services |  |  |  |  |  |  |  |  | 5,355.6 | 5,513.9 | $ 5,374.4
Service | Reporting Segments | Americas Staffing |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from services |  |  |  |  |  |  |  |  | 2,320.1 | 2,417.7 | 2,345.9
Service | Reporting Segments | GTS |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from services |  |  |  |  |  |  |  |  | 2,024.5 | 1,997.4 | 1,998.9
Service | Reporting Segments | International Staffing |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from services |  |  |  |  |  |  |  |  | 1,025.9 | 1,116.6 | 1,048.2
Service | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from services |  |  |  |  |  |  |  |  | $ (14.9) | $ (17.8) | $ (18.6)

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