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Revenue - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018 | Dec. 30, 2018 | Jan. 01, 2018
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Earnings invested in the business | $ 1,238.1 |  | $ 1,238.1 |  | $ 1,138.1 |
Revenue | 1,367.5 | $ 1,386.9 | 2,750.1 | $ 2,756.8 |  |
Americas |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Revenue | 1,082.0 | 1,083.4 | 2,189.1 | 2,151.4 |  |
Americas | Global Talent Solutions |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Revenue | 488.4 | 483.9 | 972.8 | 952.5 |  |
EMEA |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Revenue | 278.9 | 297.9 | 548.9 | 594.7 |  |
EMEA | Global Talent Solutions |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Revenue | 10.9 | 11.2 | 22.0 | 23.3 |  |
Deferred Sales Commissions |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Capitalized contract cost | 1.8 |  | 1.8 |  | 2.3 |
Capitalized contract cost, amortization | 0.4 | 0.4 | 0.9 | 0.8 |  |
Deferred Fulfillment Costs |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Capitalized contract cost | 3.0 |  | 3.0 |  | $ 3.0 |
Capitalized contract cost, amortization | $ 3.1 | $ 2.5 | $ 6.5 | $ 4.6 |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Earnings invested in the business |  |  |  |  |  | $ 3.4
Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Contract with customer, asset, gross |  |  |  |  |  | 5.2
Deferred tax liabilities, net |  |  |  |  |  | 1.2
Transferred at Point in Time | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Deferred revenue |  |  |  |  |  | $ 0.6

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