Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net earnings	$ 161.5	$ 103.6
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net gain on investments and other	(1.4)	(1.2)
Depreciation and amortization	103.7	81.3
Change in estimated acquisition earnout payables	1.0	(6.0)
Amortization of deferred compensation and restricted stock	6.4	5.3
Stock-based and other noncash compensation expense	5.5	11.4
Effect of changes in foreign exchange rates	0.9	0.1
Net change in restricted cash	(65.7)	3.0
Net change in premiums receivable	75.1	95.2
Net change in premiums payable	(55.5)	(80.2)
Net change in other current assets	12.2	20.6
Net change in accrued compensation and other accrued liabilities	(42.6)	(34.9)
Net change in fees receivable/unearned fees	(7.9)	(6.6)
Net change in income taxes payable	12.9	(9.8)
Net change in deferred income taxes	3.3	28.3
Net change in other noncurrent assets and liabilities	(30.0)	(24.5)
Net cash provided by operating activities	179.4	185.6
Cash flows from investing activities:
Net additions to fixed assets	(36.1)	(35.3)
Cash paid for acquisitions, net of cash acquired	(137.9)	(241.8)
Net proceeds from sales of operations/books of business	8.9	12.7
Net proceeds (funding) of investment transactions	10.7	(3.7)
Net cash used by investing activities	(154.4)	(268.1)
Cash flows from financing activities:
Proceeds from issuance of common stock	60.9	54.8
Tax impact from issuance of common stock	3.7	2.2
Repurchases of common stock		(1.1)
Dividends paid	(119.7)	(108.6)
Borrowings on line of credit facility	162.0	102.0
Repayments on line of credit facility	(172.0)	(102.0)
Borrowings of long-term debt	50.0	125.0
Net cash (used) provided by financing activities	(15.1)	72.3
Effect of changes in foreign exchange rates on cash and cash equivalents	4.1	1.8
Net increase (decrease) in cash and cash equivalents	14.0	(8.4)
Cash and cash equivalents at beginning of period	291.2	249.8
Cash and cash equivalents at end of period	305.2	241.4
Supplemental disclosures of cash flow information:
Interest paid	38.0	33.8
Income taxes paid	$ 17.0	$ 31.0