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Earnings per Share - Components of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share Reconciliation [Abstract]        
Net income attributable to Franklin Resources, Inc. $ 92.3 $ 174.0 $ 407.3 $ 549.5
Less: allocation of earnings to participating nonvested stock and stock unit awards - basic 13.3 7.5 42.9 23.8
Less: allocation of earnings to participating nonvested stock and stock unit awards - diluted 13.3 7.5 42.9 23.8
Net Income Available to Common Stockholders - basic 79.0 166.5 364.4 525.7
Net Income Available to Common Stockholders - diluted $ 79.0 $ 166.5 $ 364.4 $ 525.7
Weighted-average shares outstanding – basic 515.7 516.5 517.4 507.2
Dilutive effect of nonparticipating nonvested stock unit awards 0.8 0.7 0.8 0.8
Weighted-Average Shares Outstanding – Diluted 516.5 517.2 518.2 508.0
Earnings per Share [Abstract]        
Basic $ 0.15 $ 0.32 $ 0.70 $ 1.04
Diluted $ 0.15 $ 0.32 $ 0.70 $ 1.03