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Segment Disclosures - Segment Earnings from Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Earnings from Operations: |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 254.4 | $ 239.1 | $ 240.5 | $ 238.2 | $ 263.0 | $ 230.7 | $ 228.8 | $ 231.6 | $ 972.2 | $ 954.1 | $ 906.3
SG&A expenses | (221.3) | (217.2) | (220.1) | (226.2) | $ (234.6) | $ (212.5) | $ (208.5) | $ (215.2) | (884.8) | (870.8) | (843.1)
Earnings from operations |  |  |  |  |  |  |  |  | 87.4 | 83.3 | 63.2
Loss on investment in Persol Holdings | $ (83.2) | $ 15.8 | $ (52.5) | $ 23.7 |  |  |  |  | (96.2) | 0.0 | 0.0
Gain on investment in PersolKelly Asia Pacific |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 87.2
Other expense, net |  |  |  |  |  |  |  |  | (0.6) | (1.6) | (0.7)
Earnings (loss) before taxes and equity in net earnings (loss) of affiliate |  |  |  |  |  |  |  |  | (9.4) | 81.7 | 149.7
Reporting Segments | Americas Staffing |  |  |  |  |  |  |  |  |  |  |
Earnings from Operations: |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 441.3 | 429.1 | 398.2
SG&A expenses |  |  |  |  |  |  |  |  | (364.2) | (346.4) | (329.4)
Earnings from operations |  |  |  |  |  |  |  |  | 77.1 | 82.7 | 68.8
Reporting Segments | GTS |  |  |  |  |  |  |  |  |  |  |
Earnings from Operations: |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 381.1 | 373.7 | 345.9
SG&A expenses |  |  |  |  |  |  |  |  | (296.5) | (296.7) | (287.7)
Earnings from operations |  |  |  |  |  |  |  |  | 84.6 | 77.0 | 58.2
Reporting Segments | International Staffing |  |  |  |  |  |  |  |  |  |  |
Earnings from Operations: |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 152.3 | 153.7 | 166.4
SG&A expenses |  |  |  |  |  |  |  |  | (132.3) | (131.6) | (146.9)
Earnings from operations |  |  |  |  |  |  |  |  | 20.0 | 22.1 | 19.5
Less: Intersegment revenue |  |  |  |  |  |  |  |  |  |  |
Earnings from Operations: |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | (2.5) | (2.4) | (4.2)
SG&A expenses |  |  |  |  |  |  |  |  | 2.5 | 2.4 | 4.2
Earnings from operations |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Corporate |  |  |  |  |  |  |  |  |  |  |
Earnings from Operations: |  |  |  |  |  |  |  |  |  |  |
Earnings from operations |  |  |  |  |  |  |  |  | $ (94.3) | $ (98.5) | $ (83.3)

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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