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Fair Value Measurements (Tables) | 3 Months Ended
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Apr. 01, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Assets Measured on Recurring Basis |
|  | Fair Value Measurements on a Recurring Basis As of First Quarter-End 2018
Description |  | Total |  | Level 1 |  | Level 2 |  | Level 3
|  | (In millions of dollars)
Money market funds |  | $ | 4.3 |  |  | $ | 4.3 |  |  | $ | — |  |  | $ | — |
Investment in Persol Holdings |  | 265.2 |  |  | 265.2 |  |  | — |  |  | — |
Total assets at fair value |  | $ | 269.5 |  |  | $ | 269.5 |  |  | $ | — |  |  | $ | — |
|  | Fair Value Measurements on a Recurring Basis As of Year-End 2017
Description |  | Total |  | Level 1 |  | Level 2 |  | Level 3
|  | (In millions of dollars)
Money market funds |  | $ | 4.3 |  |  | $ | 4.3 |  |  | $ | — |  |  | $ | — |
Investment in Persol Holdings |  | 228.1 |  |  | 228.1 |  |  | — |  |  | — |
Total assets at fair value |  | $ | 232.4 |  |  | $ | 232.4 |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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