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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenues from services $ 21,034.3 $ 19,654.1 $ 19,329.9
Cost of services 17,549.7 16,320.3 16,034.1
Gross profit 3,484.6 3,333.8 3,295.8
Selling and administrative expenses 2,696.4 2,583.0 2,606.9
Operating profit 788.2 750.8 688.9
Interest and other expenses 50.9 49.5 28.2
Earnings before income taxes 737.3 701.3 660.7
Provision for income taxes 191.9 257.6 241.5
Net earnings $ 545.4 $ 443.7 $ 419.2
Net earnings per share - basic (in dollars per share) $ 8.13 $ 6.33 $ 5.46
Net earnings per share - diluted (in dollars per share) $ 8.04 $ 6.27 $ 5.40
Weighted average shares - basic (in shares) 67.1 70.1 76.8
Weighted average shares - diluted (in shares) 67.9 70.8 77.7