Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues	$ 1,387.8	$ 1,404.7	$ 4,188.3	$ 4,086.0
Expenses:
Selling, general and administrative	272.8	292.0	870.2	875.6
Total expenses	1,085.2	1,132.5	3,337.2	3,358.3
Operating income	302.6	272.2	851.1	727.7
Other income/(expense):
Interest income	1.6	1.3	3.6	3.8
Interest expense	(38.4)	(37.2)	(111.4)	(104.2)
Other income, net (Note 1)	0.6	2.9	13.1	9.4
Total other expense, net	(36.2)	(33.0)	(94.7)	(91.0)
Income before income taxes	266.4	239.2	756.4	636.7
Provision for income taxes	57.8	3.6	116.6	72.9
Net income	$ 208.6	$ 235.6	$ 639.8	$ 563.8
Earnings per share:
Basic (USD per share)	$ 0.47	$ 0.51	$ 1.41	$ 1.20
Diluted (USD per share)	$ 0.46	$ 0.51	$ 1.40	$ 1.19
Weighted-average shares outstanding:
Basic (shares)	446.8	462.8	454.8	470.6
Diluted (shares)	449.0	465.4	457.4	473.6
Cash dividends declared per common share (USD per share)	$ 0.19	$ 0.175	$ 0.57	$ 0.525
Services
Expenses:
Cost of services (Note 1)	$ 812.4	$ 840.5	$ 2,467.0	$ 2,482.7