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Revenue - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018 | Dec. 30, 2018 | Jan. 01, 2018
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Earnings invested in the business | $ 1,224.6 |  | $ 1,224.6 |  | $ 1,138.1 |
Revenue | 1,267.7 | $ 1,342.4 | 4,017.8 | $ 4,099.2 |  |
Americas |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Revenue | 997.4 | 1,048.1 | 3,186.5 | 3,199.5 |  |
Americas | Global Talent Solutions |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Revenue | 485.0 | 490.4 | 1,457.8 | 1,442.9 |  |
EMEA |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Revenue | 262.8 | 288.1 | 811.7 | 882.8 |  |
EMEA | Global Talent Solutions |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Revenue | 10.0 | 11.0 | 32.0 | 34.3 |  |
Deferred Sales Commissions |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Capitalized contract cost | 1.6 |  | 1.6 |  | 2.3 |
Capitalized contract cost, amortization | 0.4 | 0.4 | 1.3 | 1.2 |  |
Deferred Fulfillment Costs |  |  |  |  |  |
Revenue from Contract with Customer [Line Items] |  |  |  |  |  |
Capitalized contract cost | 3.6 |  | 3.6 |  | $ 3.0 |
Capitalized contract cost, amortization | $ 3.8 | $ 4.1 | $ 10.3 | $ 8.7 |  |
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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