Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net earnings	$ 268.6	$ 195.0	$ 144.1
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net gain on investments and other	(17.1)	(3.9)	(5.5)
Depreciation and amortization	178.6	140.4	115.2
Change in estimated acquisition earnout payables	1.7	3.4	(6.2)
Amortization of deferred compensation and restricted stock	19.0	8.3	6.8
Stock-based and other noncash compensation expense	7.7	7.5	14.3
Effect of exchange rate changes	(0.2)	1.9	0.3
Net change in restricted cash	(58.6)	(90.2)	31.9
Net change in premiums receivable	(85.4)	11.5	52.1
Net change in premiums payable	114.3	33.3	(55.8)
Net change in other current assets	(57.4)	52.4	(8.1)
Net change in accrued compensation and other accrued liabilities	36.3	19.2	12.8
Net change in fees receivable/unearned fees	(5.9)	4.3	(4.1)
Net change in income taxes payable	4.3	14.0	(10.4)
Net change in deferred income taxes	(53.8)	(20.4)	21.5
Net change in other noncurrent assets and liabilities	(2.2)	(33.7)	(24.9)
Net cash provided by operating activities	349.9	343.0	284.0
Cash flows from investing activities:
Net additions to fixed assets	(93.6)	(51.0)	(45.9)
Cash paid for acquisitions, net of cash acquired	(727.7)	(344.1)	(264.8)
Net proceeds from sales of operations	5.5	11.4	14.0
Net proceeds (funding) of investment transactions	(35.9)	1.5	(14.5)
Net cash used by investing activities	(851.7)	(382.2)	(311.2)
Cash flows from financing activities:
Proceeds from issuance of common stock	76.2	82.3	73.9
Tax impact from issuance of common stock	7.5	0.5	3.7
Repurchases of common stock		(1.5)	(1.2)
Dividends paid	(182.6)	(204.4)	(145.8)
Borrowings on line of credit facilities	890.5	303.0	151.0
Repayments on line of credit facilities	(489.0)	(184.0)	(141.0)
Borrowings of corporate related long-term debt	200.0	50.0	125.0
Net cash provided by financing activities	502.6	45.9	65.6
Effect of exchange rate changes on cash and cash equivalents	(4.8)	4.2	3.0
Net (decrease) increase in cash and cash equivalents	(4.0)	10.9	41.4
Cash and cash equivalents at beginning of year	302.1	291.2	249.8
Cash and cash equivalents at end of year	298.1	302.1	291.2
Supplemental disclosures of cash flow information:
Interest paid	49.2	42.2	38.4
Income taxes paid	$ 49.2	$ 47.5	$ 32.0