CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating activities:
Net income	$ 82.1	$ 79.1
Adjustments to net income:
Depreciation and amortization	21.9	26.0
Deferred income taxes	13.5	12.1
Amortization of stock-based compensation	18.5	22.5
Investment gains, net	(6.4)	(6.9)
Amortization of debt discount and deferred issuance costs	7.9	8.4
Loss on early extinguishment of debt	13.5	7.2
Payment of deferred commissions, net	(3.3)	(3.9)
Other, net	(1.0)	0.3
Changes in working capital items:
Accounts receivable	2.6	5.2
Other current assets	(6.6)	6.8
Accounts payable and accrued compensation payable	(5.1)	(8.7)
Other liabilities	(5.6)	(6.6)
Net operating activities	132.0	141.5
Investing activities:
Purchase of property and equipment	(5.0)	(4.4)
Purchase of investment securities	(167.8)	(96.4)
Proceeds from sales and maturities of investment securities	112.2	69.5
Net investing activities	(60.6)	(31.3)
Financing activities:
Proceeds from issuance of stock warrants	10.5
Purchase of convertible note hedge	(16.1)
Debt issuance costs	(3.3)
Repayment of long-term debt	(8.9)	(65.8)
Purchase of noncontrolling interests	(34.1)	(6.5)
Proceeds from stock plans	7.1	5.3
Proceeds from stock option issuance		4.9
Excess tax benefit from equity-based compensation	1.6	1.3
Repurchase of common stock	(22.2)	(14.9)
Distributions to noncontrolling interests	(5.9)	(9.1)
Principal payments under capital lease obligations	(0.8)	(0.8)
Dividends paid to shareholders	(26.5)	(31.9)
Net financing activities	(98.6)	(117.5)
Cash and cash equivalents:
Effect of exchange rate changes	(1.6)
Net change	(28.8)	(7.3)
At beginning of period	387.0	360.0
At end of period	358.2	352.7
Supplemental cash flow information:
Cash paid for interest	18.4	19.9
Cash paid for income taxes	$ 46.2	$ 27.3