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Revenue - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 01, 2018 | Apr. 02, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Earnings invested in the business | $ 1,153.2 |  |  | $ 983.6
Revenue | $ 1,369.9 | $ 1,289.7 |  |
Customer payment terms | 60 days |  |  |
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] |  |  |  |
Customer contracts |  |  | 5.2 |
Deferred tax liability |  |  | 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 |
Americas |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenue | $ 1,068.0 | 1,044.5 |  |
Americas | Global Talent Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenue | 468.6 | 475.7 |  |
EMEA |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenue | 296.8 | 241.0 |  |
EMEA | Global Talent Solutions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenue | 12.1 | $ 7.4 |  |
Deferred Sales Commissions |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Capitalized contract cost | 2.8 |  | 3.2 |
Capitalized contract cost, amortization expense | 0.4 |  |  |
Deferred Fulfillment Costs |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Capitalized contract cost | 1.6 |  | $ 2.0 |
Capitalized contract cost, amortization expense | $ 2.1 |  |  |

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