Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Operating Revenues
Operating revenues	$ 5,566.5	$ 5,669.4	$ 6,204.5
Operating Expenses
Compensation and benefits	1,873.9	1,584.7	1,390.6
Sales, distribution and marketing	1,703.1	1,819.6	2,039.7
Information systems and technology	288.4	258.5	243.9
Occupancy	147.9	133.6	128.6
Amortization of intangible assets	54.0	14.7	1.8
General, administrative and other	450.3	391.4	371.7
Total operating expenses	4,517.6	4,202.5	4,176.3
Operating Income	1,048.9	1,466.9	2,028.2
Other Income (Expenses)
Investment and other income (losses), net	(38.4)	141.4	200.3
Interest expense	(33.4)	(22.4)	(46.3)
Other income (expenses), net	(31.0)	180.9	187.0
Income before taxes	1,017.9	1,647.8	2,215.2
Taxes on income	230.8	442.3	1,472.5
Net income	787.1	1,205.5	742.7
Less: net income (loss) attributable to
Redeemable noncontrolling interests	48.6	6.2	(12.8)
Nonredeemable noncontrolling interests	(60.4)	3.6	(8.9)
Net Income Attributable to Franklin Resources, Inc.	$ 798.9	$ 1,195.7	$ 764.4
Earnings per Share
Basic	$ 1.59	$ 2.35	$ 1.39
Diluted	$ 1.59	$ 2.35	$ 1.39
Investment management fees [Member]
Operating Revenues
Operating revenues	$ 3,981.7	$ 3,985.2	$ 4,367.5
Sales and distribution fees [Member]
Operating Revenues
Operating revenues	1,362.0	1,444.6	1,599.8
Shareholder servicing fees [Member]
Operating Revenues
Operating revenues	195.1	216.3	221.9
Other [Member]
Operating Revenues
Operating revenues	27.7	23.3	15.3
Consolidated Investment Products [Member]
Other Income (Expenses)
Investment and other income (losses), net	70.2	78.8	59.6
Expenses of consolidated investment products	29.4	$ 16.9	$ 26.6
Less: net income (loss) attributable to
Redeemable noncontrolling interests	$ 45.0