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Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 29, 2019 | Dec. 30, 2018 | Dec. 31, 2017
Income Statement [Abstract] |  |  |
Revenue from services | $ 5,355.6 | $ 5,513.9 | $ 5,374.4
Cost of services | 4,387.2 | 4,541.7 | 4,420.3
Gross profit | 968.4 | 972.2 | 954.1
Selling, general and administrative expenses | 883.1 | 884.8 | 870.8
Gain on sale of assets | (12.3) | 0.0 | 0.0
Asset impairment charge | 15.8 | 0.0 | 0.0
Earnings from operations | 81.8 | 87.4 | 83.3
Gain (loss) on investment in Persol Holdings | 35.8 | (96.2) | 0.0
Other income (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
Net earnings before equity in net earnings (loss) of affiliate | 116.0 | 17.7 | 68.9
Income tax expense (benefit) | 0.4 | (27.1) | 12.8
Equity in net earnings (loss) of affiliate | (3.6) | 5.2 | 2.7
Net earnings | $ 112.4 | $ 22.9 | $ 71.6
Basic earnings per share | $ 2.85 | $ 0.59 | $ 1.84
Diluted earnings per share | $ 2.84 | $ 0.58 | $ 1.81
Average shares outstanding (millions): |  |  |
Basic (in shares) | 39.1 | 38.8 | 38.3
Diluted (in shares) | 39.2 | 39.1 | 39.0

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