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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Revenues from services $ 4,587.7 $ 4,542.2
Cost of services 3,813.9 3,780.2
Gross profit 773.8 762.0
Selling and administrative expenses 642.1 639.2
Operating profit 131.7 122.8
Interest and other expenses 12.7 10.6
Earnings before income taxes 119.0 112.2
Provision for income taxes 47.3 46.5
Net earnings $ 71.7 $ 65.7
Net earnings per share - basic (in dollars per share) $ 0.98 $ 0.83
Net earnings per share - diluted (in dollars per share) $ 0.98 $ 0.83
Weighted average shares - basic (in shares) 72.8 78.7
Weighted average shares - diluted (in shares) 73.5 79.6