Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net earnings	$ 356.8	$ 303.4	$ 268.6
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net gain on investments and other	(6.6)	(23.0)	(17.1)
Net earnings attributable to noncontrolling interests	32.3	24.1	16.0
Depreciation and amortization	334.2	258.9	178.6
Change in estimated acquisition earnout payables	40.6	17.5	1.7
Amortization of deferred compensation and restricted stock	22.7	22.9	19.0
Stock-based and other noncash compensation expense	11.2	10.6	7.7
Effect of changes in foreign exchange rate	(0.2)	(0.5)	(0.2)
Net change in restricted cash	(45.6)	(62.1)	(58.6)
Net change in premiums receivable	(209.3)	95.3	(85.4)
Net change in premiums payable	406.6	60.0	114.3
Net change in other current assets	(34.7)	(150.5)	(57.4)
Net change in accrued compensation and other accrued liabilities	217.8	191.6	42.7
Net change in fees receivable/unearned fees	(49.6)	(26.0)	(5.9)
Net change in income taxes payable	(18.5)	4.9	4.3
Net change in deferred income taxes	(161.2)	(126.1)	(53.8)
Net change in other noncurrent assets and liabilities	(89.5)	(22.9)	(11.5)
Unrealized foreign currency remeasurement (loss) gain	(154.4)	(141.5)	9.5
Net cash provided by operating activities	652.6	436.6	372.5
Cash flows from investing activities:
Net additions to fixed assets	(99.0)	(81.5)	(93.6)
Cash paid for acquisitions, net of cash acquired	(342.3)	(1,918.3)	(727.7)
Net proceeds from sales of operations/books of business	9.2	8.2	5.5
Net funding of investment transactions	(29.5)	(20.1)	(35.9)
Net cash used by investing activities	(461.6)	(2,011.7)	(851.7)
Cash flows from financing activities:
Proceeds from issuance of common stock	203.3	997.0	76.2
Tax impact from issuance of common stock	5.3	6.9	7.5
Payments for noncontrolling interests	(39.9)	(34.3)	(22.6)
Dividends paid	(257.5)	(223.1)	(182.6)
Net borrowings on premium financing debt facility	23.9	7.5
Borrowings on line of credit facilities	849.0	1,109.9	890.5
Repayments on line of credit facilities	(794.0)	(1,500.4)	(489.0)
Net borrowings of corporate related long-term debt		1,200.0	200.0
Net cash (used) provided by financing activities	(9.9)	1,563.5	480.0
Effect of changes in foreign exchange rates on cash and cash equivalents	(15.1)	27.9	(4.8)
Net increase (decrease) in cash and cash equivalents	166.0	16.3	(4.0)
Cash and cash equivalents at beginning of year	314.4	298.1	302.1
Cash and cash equivalents at end of year	480.4	314.4	298.1
Supplemental disclosures of cash flow information:
Interest paid	103.9	82.5	49.2
Income taxes paid	$ 78.3	$ 72.9	$ 49.2