Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net earnings	$ 303.4	$ 268.6	$ 195.0
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net gain on investments and other	(23.0)	(17.1)	(3.9)
Depreciation and amortization	258.9	178.6	140.4
Change in estimated acquisition earnout payables	17.5	1.7	3.4
Amortization of deferred compensation and restricted stock	22.9	19.0	8.3
Stock-based and other noncash compensation expense	10.6	7.7	7.5
Effect of changes in foreign exchange rate	(0.5)	(0.2)	1.9
Net change in restricted cash	(62.1)	(58.6)	(90.2)
Net change in premiums receivable	95.3	(85.4)	11.5
Net change in premiums payable	60.0	114.3	33.3
Net change in other current assets	(150.5)	(57.4)	52.4
Net change in accrued compensation and other accrued liabilities	184.2	36.3	19.2
Net change in fees receivable/unearned fees	(26.0)	(5.9)	4.3
Net change in income taxes payable	4.9	4.3	14.0
Net change in deferred income taxes	(126.1)	(53.8)	(20.4)
Net change in other noncurrent assets and liabilities	(167.2)	(2.2)	(33.7)
Net cash provided by operating activities	402.3	349.9	343.0
Cash flows from investing activities:
Net additions to fixed assets	(81.5)	(93.6)	(51.0)
Cash paid for acquisitions, net of cash acquired	(1,918.3)	(727.7)	(344.1)
Net proceeds from sales of operations/books of business	8.2	5.5	11.4
Net (funding) proceeds of investment transactions	(20.1)	(35.9)	1.5
Net cash used by investing activities	(2,011.7)	(851.7)	(382.2)
Cash flows from financing activities:
Proceeds from issuance of common stock	997.0	76.2	82.3
Tax impact from issuance of common stock	6.9	7.5	0.5
Repurchases of common stock			(1.5)
Dividends paid	(223.1)	(182.6)	(204.4)
Net borrowings on premium financing debt facility	7.5
Borrowings on line of credit facilities	1,109.9	890.5	303.0
Repayments on line of credit facilities	(1,500.4)	(489.0)	(184.0)
Net borrowings of corporate related long-term debt	1,200.0	200.0	50.0
Net cash provided by financing activities	1,597.8	502.6	45.9
Effect of changes in foreign exchange rates on cash and cash equivalents	27.9	(4.8)	4.2
Net increase (decrease) in cash and cash equivalents	16.3	(4.0)	10.9
Cash and cash equivalents at beginning of year	298.1	302.1	291.2
Cash and cash equivalents at end of year	314.4	298.1	302.1
Supplemental disclosures of cash flow information:
Interest paid	82.5	49.2	42.2
Income taxes paid	$ 72.9	$ 49.2	$ 47.5