Condensed Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows - operating activities:
Net income	$ 93.2	$ 55.3
Depreciation and amortization	33.2	34.0
Net gains on investments	(70.0)	(16.7)
Amortization of share based compensation	5.9	6.0
Equity in earnings of unconsolidated affiliates	(5.6)	(5.3)
Dividends from unconsolidated affiliates	0.2	0.2
Deferred income taxes	(1.0)	(0.5)
Changes in accounts receivable	4.0	(12.2)
Changes in other assets	(10.3)	(34.5)
Changes in accounts payable and accrued liabilities	(5.8)	26.5
Changes in income taxes payable	25.4	22.9
Changes in deferred revenues and gains	11.1	(9.8)
Changes in accrued compensation and benefits	(43.9)	(20.6)
Other, net	5.8	(2.5)
Total adjustments to net income	(51.0)	(12.5)
Net	42.2	42.8
Cash flows - investing activities:
Capital expenditures	(27.6)	(30.7)
Proceeds from unconsolidated affiliates	3.1	0.1
Investments in securities	(31.7)	(70.6)
Proceeds from sales/maturities of investments	133.6	89.1
Net (increase) decrease in restricted cash and cash equivalents held to satisfy client funds obligations	44.8	(32.7)
Other, net	(17.8)	2.3
Net	104.4	(42.5)
Cash flows - financing activities:
Proceeds from issuance of common stock	12.2	38.5
Principal payments on debt	(15.1)	(5.4)
Net borrowings (payments) on revolving credit facilities	40.5	(17.9)
Net increase (decrease) in client funds obligations	(65.5)	36.6
Common stock repurchased	(74.1)	(26.3)
Payment for acquisition of non-controlling interest		(17.7)
Payment of cash dividends	(13.3)
Excess tax benefits from share based compensation	1.2	3.3
Net	(114.1)	11.1
Net increase (decrease) in cash and cash equivalents	32.5	11.4
Cash and cash equivalents, beginning of period	88.3	40.9
Cash and cash equivalents, end of period	$ 120.8	$ 52.3