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Quarterly Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenues from services $ 5,637.5 $ 5,464.8 $ 5,174.8 $ 4,757.2 $ 4,956.1 $ 5,088.2 $ 5,022.1 $ 4,587.7 $ 21,034.3 $ 19,654.1 $ 19,329.9
Gross profit 934.5 900.6 861.7 787.8 841.0 858.3 860.7 773.8 3,484.6 3,333.8 3,295.8
Operating profit 238.7 227.9 194.6 127.0 212.0 211.1 196.0 131.7 788.2 750.8 688.9
Net earnings $ 216.3 $ 137.7 $ 117.0 $ 74.4 $ 127.4 $ 129.2 $ 115.4 $ 71.7 $ 545.4 $ 443.7 $ 419.2
Net earnings per share - basic (in dollars per share) $ 3.26 $ 2.06 $ 1.74 $ 1.10 $ 1.89 $ 1.89 $ 1.61 $ 0.98 $ 8.13 $ 6.33 $ 5.46
Net earnings per share - diluted (in dollars per share) 3.22 2.04 1.72 1.09 1.87 1.87 1.60 0.98 8.04 6.27 5.40
Dividends per share (in dollars per share) $ 0.93 $ 0.00 $ 0.93 $ 0.00 $ 0.86 $ 0.00 $ 0.86 $ 0.00 $ 1.86 $ 1.72 $ 1.60
Restructuring costs     $ 10.5 $ 24.0              
Net tax benefits related to the Tax Act and French tax reform $ 73.7               $ 73.7 $ 0.0 $ 0.0
Restructuring costs per diluted share (in dollars per share)     $ (0.10) $ (0.30)              
Net tax benefits per diluted share (in dollars per share) $ 1.10