Condensed Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating revenues	$ 510.5	$ 480.2	$ 1,525.3	$ 1,460.5
Out-of-pocket reimbursements	169.0	171.6	517.5	530.8
Total revenues	679.5	651.8	2,042.8	1,991.3
Costs and expenses	563.3	531.4	1,723.1	1,657.3
Depreciation and amortization	33.4	34.1	97.5	100.4
Income from operations	82.8	86.3	222.2	233.6
Interest expense	(6.4)	(8.4)	(20.0)	(27.3)
Other income, net	57.5	73.4	282.3	175.0
Equity in earnings of unconsolidated affiliates	10.2	3.8	25.2	18.9
Income before income taxes	144.1	155.1	509.7	400.2
Income taxes	44.1	58.2	171.5	131.6
Net income	$ 100.0	$ 96.9	$ 338.2	$ 268.6
Weighted average common shares outstanding	39.5	42.9	40.7	43.6
Weighted average diluted shares outstanding	39.8	43.5	41.2	44.5
Basic earnings per share	$ 2.53	$ 2.26	$ 8.30	$ 6.16
Diluted earnings per share	$ 2.51	$ 2.23	$ 8.22	$ 6.03
Cash dividends per share of common stock	$ 0.30	$ 0.30	$ 0.90	$ 0.90