Condensed Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows — operating activities:
Net income	$ 238.2	$ 171.7
Depreciation and amortization	64.1	66.3
Net gains on investments	(149.7)	(85.7)
Amortization of share based compensation	10.3	10.4
Equity in earnings of unconsolidated affiliates	(15.0)	(15.1)
Dividends from unconsolidated affiliates	1.5	129.1
Gain on contract to repurchase common stock	(18.1)	0
Deferred income taxes	(3.1)	(2.5)
Changes in accounts receivable	(13.5)	27.6
Changes in other assets	3.7	(12.7)
Changes in accounts payable and accrued liabilities	0.5	(7.2)
Changes in income taxes payable	24.5	(15.5)
Changes in deferred revenues and gains	(1.7)	(0.9)
Changes in accrued compensation and benefits	(23.1)	(22.4)
Other, net	9.7	0.5
Net cash provided from operating activities	128.3	243.6
Cash flows — investing activities:
Capital expenditures	(59.8)	(51.8)
Investments in securities	(44.4)	(53.9)
Proceeds from sales/maturities of investments	214.9	190.7
Net decrease (increase) in restricted cash and cash equivalents held to satisfy client funds obligations	(14.0)	52.8
Other, net	9.3	(13.2)
Net cash provided from investing activities	106.0	124.6
Cash flows — financing activities:
Proceeds from issuance of common stock	9.8	17.2
Principal payments on debt	(130.0)	(22.7)
Repurchases of senior convertible debentures	0	39.2
Net borrowings (payments) on revolving credit facilities	118.5	(24.1)
Net proceeds from accounts receivable securitization program	0	15.0
Net increase (decrease) in client funds obligations	14.0	(62.8)
Common stock repurchased	(205.7)	(137.0)
Payment of cash dividends	(24.5)	(26.4)
Excess tax benefits from share based compensation	4.6	1.6
Other, net	(0.2)	(0.2)
Net cash used for financing activities	(213.5)	(278.6)
Net increase in cash and cash equivalents	20.8	89.6
Cash and cash equivalents, beginning of period	62.5	88.3
Cash and cash equivalents, end of period	$ 83.3	$ 177.9