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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 27, 2020 | Mar. 29, 2020 | Sep. 29, 2019 | Jun. 28, 2020 | Sep. 27, 2020 | Sep. 29, 2019 | Dec. 29, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Indemnification liabilities, expense | $ 2.5 |  |  |  | $ 2.5 |  |
Expense related to earnout liability | 0.5 |  |  |  | 0.5 |  |
Goodwill impairment charge | 0.0 | $ 147.7 | $ 0.0 | $ 147.7 | 147.7 | $ 0.0 |
Persol Holdings Investment |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cost of equity securities | 19.6 |  |  |  | 19.6 |  | $ 18.9
Business Talent Group, LLC |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Equity securities without readily determinable fair value, amount | 5.0 |  |  |  | 5.0 |  | 5.0
Kenzie Academy Inc. |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Equity securities without readily determinable fair value, with changes in fair value in net income | 1.4 |  |  |  | 1.4 |  | 1.3
Other Assets |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Money market funds | 5.3 |  |  |  | 5.3 |  | $ 4.9
Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Indemnification liability | 2.5 |  |  |  | 2.5 |  |
Contingent consideration, liability | $ 2.1 |  |  |  | $ 2.1 |  |

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