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Revenue - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Earnings invested in the business | $ 1,138.1 | $ 983.6 |
Revenue from services | $ 5,513.9 | 5,374.4 |
Revenue, payment terms | 60 days |  |
Capitalized contract cost, gross | $ 2.3 |  |
Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Earnings invested in the business |  |  | $ 3.4
Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Contract with customer, asset |  |  | 5.2
Deferred tax liabilities |  |  | 1.2
Transferred at Point in Time | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred revenue |  |  | 0.6
Total EMEA |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue from services | 1,162.5 | 1,085.5 |
Total EMEA | Global Talent Solutions |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue from services | 45.9 | 37.4 |
Total Americas |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue from services | 4,329.2 | 4,270.6 |
Total Americas | Global Talent Solutions |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue from services | 1,929.3 | $ 1,943.3 |
Deferred Sales Commissions |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Capitalized contract cost, gross |  |  | 3.2
Capitalized contract cost, amortization | 1.7 |  |
Deferred Fulfillment Costs |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Capitalized contract cost, gross | 3.0 |  | $ 2.0
Capitalized contract cost, amortization | $ 13.0 |  |

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