CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flow from (used in) operating activities:
Net income	$ 785.6	$ 669.6	$ 411.4
Adjustments to reconcile Net income to net cash flow from operating activities:
Intangible amortization and impairments	122.2	128.2	200.0
Depreciation and other amortization	16.9	14.0	14.1
Deferred income tax provision	62.8	27.7	11.1
Imputed interest expense and contingent payment arrangements	30.1	31.7	(26.1)
Income from equity method investments, net of amortization	(281.7)	(307.8)	(129.7)
Distributions received from equity method investments	366.9	226.6	104.7
Share-based compensation and Affiliate equity expense	113.7	84.1	69.3
Other non-cash items	11.4	20.0	24.3
Changes in assets and liabilities:
(Increase) decrease in receivables	26.5	(101.8)	(41.6)
Increase in other assets	(7.1)	(12.8)	(4.7)
Increase in payables, accrued liabilities and other liabilities	144.9	177.6	0.4
Cash flow from operating activities	1,392.2	957.1	633.2
Cash flow from (used in) investing activities:
Investments in Affiliates	(1,245.0)	(26.3)	(797.4)
Purchase of fixed assets	(19.2)	(24.0)	(20.0)
Purchase of investment securities	(21.2)	(11.4)	(19.1)
Sale of investment securities	17.3	11.4	34.2
Cash flow used in investing activities	(1,268.1)	(50.3)	(802.3)
Cash flow from (used in) financing activities:
Borrowings of senior debt	1,746.5	760.0	970.0
Repayments of senior debt and convertible securities	(1,020.6)	(1,201.3)	(555.0)
Issuance of common stock	41.4	48.2	73.4
Repurchase of common stock	(190.8)	(15.7)	(60.9)
Note and contingent payments	14.4	(41.0)	(3.6)
Distributions to non-controlling interests	(569.4)	(267.1)	(181.4)
Affiliate equity issuances and repurchases	(65.7)	(118.1)	(107.9)
Excess tax benefit from share-based compensation	61.5	17.3	22.0
Settlement of forward equity sale agreement	(45.0)	(44.0)	0
Other financing items	(5.2)	(7.4)	(10.4)
Cash flow from (used in) financing activities	(32.9)	(869.1)	146.2
Effect of foreign exchange rate changes on cash and cash equivalents	(10.2)	1.5	3.8
Net increase (decrease) in cash and cash equivalents	81.0	39.2	(19.1)
Cash and cash equivalents at beginning of period	469.6	430.4	449.5
Cash and cash equivalents at end of period	550.6	469.6	430.4
Supplemental disclosure of cash flow information:
Interest paid	67.9	87.4	79.8
Income taxes paid	110.7	82.8	51.6
Supplemental disclosure of non-cash financing activities:
Settlement of 2006 junior convertible securities	217.8	0	0
Stock issued under other incentive plans	63.6	1.3	0.5
Stock received in settlement of liability	44.7	0.5	0.1
Payables recorded for Share repurchases	47.8	0	0
Payables recorded for Affiliate equity repurchases	21.5	4.0	10.6
Payables recorded under contingent payment arrangements	$ 0	$ 0	$ 28.9