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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Revenues from services $ 4,924.4 $ 4,619.1
Cost of services 4,156.3 3,895.1
Gross profit 768.1 724.0
Selling and administrative expenses 669.7 686.3
Operating profit 98.4 37.7
Interest and other expenses, net 5.4 20.5
Earnings before income taxes 93.0 17.2
Provision for income taxes 31.0 15.5
Net earnings $ 62.0 $ 1.7
Net earnings per share – basic $ 1.12 $ 0.03
Net earnings per share – diluted $ 1.11 $ 0.03
Weighted average shares - basic (in shares) 55.1 58.7
Weighted average shares - diluted (in shares) 55.7 59.0