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Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues from services	$ 5,196.6	$ 5,248.9	$ 5,373.1	$ 5,044.9	$ 5,393.2	$ 5,418.7	$ 5,656.9	$ 5,522.4	$ 20,863.5	$ 21,991.2	$ 21,034.3
Gross profit	859.6	840.3	870.4	804.8	880.3	890.6	922.7	885.4	3,375.1	3,579.0	3,484.6
Operating profit	191.6	217.0	130.8	105.5	217.9	216.7	208.3	153.8	644.9	796.7	789.2
Net earnings	$ 138.8	$ 146.1	$ 127.3	$ 53.5	$ 158.3	$ 158.0	$ 143.4	$ 97.0	$ 465.7	$ 556.7	$ 545.4
Net earnings per share - basic (in dollars per share)	$ 2.35	$ 2.44	$ 2.12	$ 0.88	$ 2.56	$ 2.45	$ 2.18	$ 1.46	$ 7.78	$ 8.62	$ 8.13
Net earnings per share - diluted (in dollars per share)	2.33	2.42	2.11	0.88	2.54	2.43	2.17	1.45	7.72	8.56	8.04
Dividends per share (in dollars per share)	$ 1.09	$ 0	$ 1.09	$ 0	$ 1.01	$ 0	$ 1.01	$ 0	$ 2.18	$ 2.02	$ 1.86

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