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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Revenues from services $ 5,656.9 $ 5,174.8 $ 11,179.3 $ 9,932.0
Cost of services 4,734.2 4,313.1 9,371.2 8,282.5
Gross profit 922.7 861.7 1,808.1 1,649.5
Selling and administrative expenses 714.4 666.5 1,446.0 1,326.4
Operating profit 208.3 195.2 362.1 323.1
Interest and other expenses 10.5 11.0 26.6 26.8
Earnings before income taxes 197.8 184.2 335.5 296.3
Provision for income taxes 54.4 67.2 95.1 104.9
Net earnings $ 143.4 $ 117.0 $ 240.4 $ 191.4
Net earnings per share - basic (in dollars per share) $ 2.18 $ 1.74 $ 3.65 $ 2.83
Net earnings per share - diluted (in dollars per share) $ 2.17 $ 1.72 $ 3.62 $ 2.80
Weighted average shares - basic (in shares) 65.7 67.4 65.8 67.5
Weighted average shares - diluted (in shares) 66.1 68.0 66.4 68.3