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Consolidated Statement of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Earnings from continuing operations $ 195.0 $ 144.1 $ 163.3
Adjustments to reconcile earnings from continuing operations to net cash provided by operating activities:      
Net gain on investments and other (3.9) (5.5) (5.9)
Depreciation and amortization 140.4 115.2 93.1
Change in estimated acquisition earnout payables 3.4 (6.2) (2.6)
Amortization of deferred compensation and restricted stock 8.3 6.8 6.6
Stock-based and other noncash compensation expense 7.5 14.3 9.0
Effect of exchange rate changes 1.9 0.3 0.8
Net change in restricted cash (90.2) 31.9 (16.9)
Net change in premiums receivable 11.5 52.1 (2.7)
Net change in premiums payable 33.3 (55.8) (11.5)
Net change in other current assets 52.4 (8.1) (11.7)
Net change in accrued compensation and other accrued liabilities 19.2 12.8 5.9
Net change in fees receivable/unearned fees 4.3 (4.1) (11.8)
Net change in income taxes payable 14.0 (10.4) (23.1)
Net change in deferred income taxes (20.4) 21.5 31.0
Net change in other noncurrent assets and liabilities (33.7) (24.9) 7.7
Net cash provided by operating activities of continuing operations 343.0 284.0 231.2
Earnings from discontinued operations     10.8
Other non-cash items from discontinued operations     (12.5)
Net cash provided by operating activities 343.0 284.0 229.5
Cash flows from investing activities:      
Net additions to fixed assets (51.0) (45.9) (25.1)
Cash paid for acquisitions, net of cash acquired (344.1) (264.8) (80.1)
Net proceeds from sales of operations 11.4 14.0 3.2
Net proceeds (funding) of investment transactions 1.5 (14.5) 9.4
Net cash used by investing activities (382.2) (311.2) (92.6)
Cash flows from financing activities:      
Proceeds from issuance of common stock 82.3 73.9 36.7
Tax impact from issuance of common stock 0.5 3.7 1.4
Repurchases of common stock (1.5) (1.2) (0.8)
Dividends paid (204.4) (145.8) (133.5)
Borrowings on line of credit facilities 303.0 151.0 48.0
Repayments on line of credit facilities (184.0) (141.0) (48.0)
Borrowings of corporate related long-term debt 50.0 125.0  
Net cash provided (used) by financing activities 45.9 65.6 (96.2)
Effect of exchange rate changes on cash and cash equivalents 4.2 3.0 3.2
Net increase in cash and cash equivalents 10.9 41.4 43.9
Cash and cash equivalents at beginning of year 291.2 249.8 205.9
Cash and cash equivalents at end of year 302.1 291.2 249.8
Supplemental disclosures of cash flow information:      
Interest paid 42.2 38.4 34.7
Income taxes paid $ 47.5 $ 32.0 $ 37.6