Condensed Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net Income (Loss) Attributable to Parent	$ 171.7	$ 200.2
Cash flows - operating activities:
Net income		200.2
Depreciation and amortization	66.3	76.3
Net gains on investments	(85.7)	(161.2)
Amortization of share based compensation	10.4	14.8
Equity in earnings of unconsolidated affiliates	(15.1)	(6.7)
Dividends from unconsolidated affiliates	129.1	0.9
Deferred income taxes	(2.5)	(4.5)
Changes in accounts receivable	27.6	(0.3)
Changes in other assets	(12.7)	(35.8)
Changes in accounts payable and accrued liabilities	(7.2)	(14.0)
Changes in income taxes payable	(15.5)	81.5
Changes in deferred revenues and gains	(0.9)	(21.6)
Changes in accrued compensation and benefits	(22.4)	(17.5)
Other, net	0.5	(2.4)
Total adjustments to net income	71.9	(90.5)
Net	243.6	109.7
Cash flows - investing activities:
Capital expenditures	(51.8)	(50.4)
Investments in securities	(53.9)	(142.9)
Proceeds from sales/maturities of investments	190.7	319.0
Net (increase) decrease in restricted cash and cash equivalents held to satisfy client funds obligations	52.8	(6.1)
Other, net	(13.2)	6.3
Net	124.6	125.9
Cash flows - financing activities:
Proceeds from issuance of common stock	17.2	43.5
Principal payments on debt	(22.7)	(10.5)
Repurchases of senior convertible debentures	(39.2)
Net payments on revolving credit facilities	(24.1)	(164.6)
Net proceeds from accounts receivable securitization program	15.0
Payment of debt issuance costs	(0.2)	(0.2)
Net increase (decrease) in client funds obligations	(62.8)	8.6
Common stock repurchased	(137.0)	(27.9)
Payment for acquisition of non-controlling interest		(17.7)
Payment of cash dividends	(26.4)	(17.9)
Excess tax benefits from share based compensation	1.6	3.4
Net	(278.6)	(183.3)
Net increase in cash and cash equivalents	89.6	52.3
Cash and cash equivalents, beginning of period	88.3	40.9
Cash and cash equivalents, end of period	$ 177.9	$ 93.2