Condensed Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating revenues	$ 505.2	$ 495.2
Out-of-pocket reimbursements	178.6	187.2
Total revenues	683.8	682.4
Costs and expenses	583.7	574.6
Depreciation and amortization	32.0	33.2
Income from operations	68.1	74.6
Interest expense	(6.6)	(9.6)
Other income, net	93.6	73.2
Equity in earnings of unconsolidated affiliates	5.4	5.6
Income before income taxes	160.5	143.8
Income taxes	60.1	50.6
Net income	$ 100.4	$ 93.2
Weighted average common shares outstanding (in shares)	42.0	44.3
Weighted average diluted shares outstanding (in shares)	42.4	45.6
Basic earnings per share (in dollars per share)	$ 2.39	$ 2.10
Diluted earnings per share (in dollars per share)	$ 2.37	$ 2.04
Cash dividends per share of common stock (in dollars per share)	$ 0.30	$ 0.30