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Segment Disclosures - Segment Earnings from Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2019 | Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 30, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 29, 2019 | Dec. 30, 2018 | Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 245.1 | $ 227.7 | $ 244.0 | $ 251.6 | $ 254.4 | $ 239.1 | $ 240.5 | $ 238.2 | $ 968.4 | $ 972.2 | $ 954.1
SG&A expenses | (216.2) | (210.6) | (221.5) | (234.8) | (221.3) | (217.2) | (220.1) | (226.2) | (883.1) | (884.8) | (870.8)
Earnings from operations |  |  |  |  |  |  |  |  | 81.8 | 87.4 | 83.3
Gain (loss) on investment in Persol Holdings | $ 0.7 | $ (39.3) | $ 61.2 | $ 13.2 | $ (83.2) | $ 15.8 | $ (52.5) | $ 23.7 | 35.8 | (96.2) | 0.0
Other expense, net |  |  |  |  |  |  |  |  | (1.2) | (0.6) | (1.6)
Earnings (loss) before taxes and equity in net earnings (loss) of affiliate |  |  |  |  |  |  |  |  | 116.4 | (9.4) | 81.7
Reporting Segments | Americas Staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 429.5 | 441.3 | 429.1
SG&A expenses |  |  |  |  |  |  |  |  | (372.7) | (364.2) | (346.4)
Earnings from operations |  |  |  |  |  |  |  |  | 56.8 | 77.1 | 82.7
Reporting Segments | GTS |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 400.5 | 381.1 | 373.7
SG&A expenses |  |  |  |  |  |  |  |  | (293.1) | (296.5) | (296.7)
Earnings from operations |  |  |  |  |  |  |  |  | 107.4 | 84.6 | 77.0
Reporting Segments | International Staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 140.5 | 152.3 | 153.7
SG&A expenses |  |  |  |  |  |  |  |  | (125.3) | (132.3) | (131.6)
Earnings from operations |  |  |  |  |  |  |  |  | 15.2 | 20.0 | 22.1
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | (2.1) | (2.5) | (2.4)
SG&A expenses |  |  |  |  |  |  |  |  | 2.1 | 2.5 | 2.4
Earnings from operations |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings from operations |  |  |  |  |  |  |  |  | $ (97.6) | $ (94.3) | $ (98.5)

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