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Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues from services | $ 5,393.2 | $ 5,418.7 | $ 5,656.9 | $ 5,522.4 | $ 5,637.5 | $ 5,464.8 | $ 5,174.8 | $ 4,757.2 | $ 21,991.2 | $ 21,034.3 | $ 19,654.1
Gross profit | 880.3 | 890.6 | 922.7 | 885.4 | 934.5 | 900.6 | 861.7 | 787.8 | 3,579.0 | 3,484.6 | 3,333.8
Operating profit | 217.9 | 216.7 | 208.3 | 153.8 | 237.4 | 228.7 | 195.2 | 127.9 | 796.7 | 789.2 | 745.5
Net earnings | $ 158.3 | $ 158.0 | $ 143.4 | $ 97.0 | $ 216.3 | $ 137.7 | $ 117.0 | $ 74.4 | $ 556.7 | $ 545.4 | $ 443.7
Net earnings per share - basic (in dollars per share) | $ 2.56 | $ 2.45 | $ 2.18 | $ 1.46 | $ 3.26 | $ 2.06 | $ 1.74 | $ 1.10 | $ 8.62 | $ 8.13 | $ 6.33
Net earnings per share - diluted (in dollars per share) | 2.54 | 2.43 | 2.17 | 1.45 | 3.22 | 2.04 | 1.72 | 1.09 | 8.56 | 8.04 | 6.27
Dividends per share (in dollars per share) | $ 1.01 | $ 0 | $ 1.01 | $ 0 | $ 0.93 | $ 0 | $ 0.93 | $ 0 | $ 2.02 | $ 1.86 | $ 1.72
Restructuring costs |  |  | $ 15.3 | $ 24.0 |  |  | $ 10.5 | $ 24.0 |  |  |
Restructuring costs per diluted share (in dollars per share) |  |  | $ (0.18) | $ (0.27) |  |  | $ (0.10) | $ (0.30) |  |  |
Net tax expense (benefits) related to the Tax Act and French tax reform |  |  |  |  | $ (73.7) |  |  |  | $ 3.2 | $ (73.7) | $ 0.0
Net tax benefits per diluted share (in dollars per share) |  |  |  |  | $ 1.10 |  |  |  |  |  |

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