Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Net Income	$ 1,915.5	$ 1,820.8	$ 1,451.5
Adjustments to reconcile net income to net cash provided byoperating activities:
Depreciation and amortization	212.0	243.6	267.4
Stock-based compensation	101.3	88.7	81.7
Excess tax benefit from stock-based compensation	(19.7)	(14.7)	(11.7)
Net (gains) losses on sale of assets	(34.6)	(67.8)	(17.5)
Losses (income) from investments in equity method investees, net of tax	(68.6)	1.1	(19.9)
Other-than-temporary impairment of investments	10.1	13.6	1.5
Net (gains) losses on investments of consolidated sponsored investment products	16.5	0	0
Net (gains) losses of consolidated variable interest entities	(23.9)	86.8	0
Provision for loan losses	5.5	4.6	3.3
Deferred income taxes	16.3	(3.3)	(12.1)
Changes in operating assets and liabilities:
Increase in receivables, prepaid expenses and other	(222.8)	(230.3)	(282.3)
Increase in trading securities, net	(577.8)	(257.7)	(72.9)
Increase in trading securities of consolidated sponsored investment products, net	(203.0)	(260.7)	(70.1)
Increase (decrease) in accrued compensation and benefits	(2.6)	72.9	122.0
Increase (decrease) in commissions payable	14.4	65.5	83.0
Increase (decrease) in income taxes payable	(74.9)	32.5	93.9
Increase (decrease) in other liabilities	2.5	26.2	33.2
Net cash provided by (used in) operating activities	1,066.2	1,621.8	1,651.0
Net cash provided by (used in) investing activities
Purchase of investments	(247.2)	(499.5)	(695.5)
Liquidation of investments	831.9	690.7	784.4
Purchase of investments by consolidated sponsored investment products	(188.5)	0	0
Liquidation of investments by consolidated sponsored investment products	55.9	0	0
Purchase of investments by consolidated variable interest entities	(417.5)	(1,058.2)	0
Liquidation of investments by consolidated variable interest entities	520.1	1,295.6	0
Decrease (increase) in loans receivable, net	26.0	(30.0)	(64.2)
Proceeds from sale of loans	141.8	0	0
Decrease in loans receivable held by consolidated variable interest entities, net	59.7	157.1	0
Additions of property and equipment, net	(78.4)	(131.7)	(57.4)
Acquisitions of subsidiaries, net of cash acquired	0	(111.1)	0
Cash and cash equivalents recognized due to consolidation of variable interest entity	169.6	0	0
Cash and cash equivalents recognized due to adoption of new consolidation guidance	0	45.8	0
Cash and cash equivalents recognized due to consolidation adjustment for sponsored investment products	0	77.2	0
Net cash provided by (used in) investing activities	873.4	435.9	(32.7)
Net cash provided by (used in) financing activities
Increase (decrease) in deposits	(218.5)	234.5	(8.8)
Issuance of common stock	49.1	49.6	41.8
Dividends paid on common stock	(663.0)	(216.3)	(883.5)
Repurchase of common stock	(797.4)	(954.2)	(675.8)
Excess tax benefit from stock-based compensation	19.7	14.7	11.7
Increase (decrease) in commercial paper, net	(30.0)	(0.1)	(34.5)
Proceeds from issuance of debt	592.3	20.0	952.0
Payments on debt	0	(2.2)	(66.0)
Proceeds from issuance of debt by consolidated sponsored investment products	122.6	0	0
Payments on debt by consolidated sponsored investment products	(144.7)	0	0
Payments on debt by consolidated variable interest entities	227.1	358.0	0
Noncontrolling interests	212.1	243.8	68.2
Net Cash Provided by (Used in) Financing Activities	(1,084.9)	(968.2)	(594.9)
Effect of Exchange Rate on Cash and Cash Equivalents	(1.9)	(14.6)	(4.2)
Increase in cash and cash equivalents	852.8	1,074.9	1,019.2
Cash and cash equivalents, beginning of year	5,198.6	4,123.7	3,104.5
Cash and Cash Equivalents, End of Year	6,051.4	5,198.6	4,123.7
Supplemental Disclosure of Non-Cash Information
Increase (decrease) in noncontrolling interests due to net consolidation (deconsolidation) of certain sponsored investment products	(188.1)	343.6	(118.4)
Increase in assets (liabilities), net related to consolidation of variable interest entities	(174.9)	60.8	0
Supplemental Disclosure of Cash Flow Information
Cash paid for income taxes	819.8	761.9	533.3
Cash paid for interest	42.8	41.1	7.1
Cash paid for interest by consolidated sponsored investments products and consolidated variable interest entities	$ 50.5	$ 50.9	$ 0