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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 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share Reconciliation [Abstract]        
Net income attributable to Franklin Resources, Inc. $ 124.2 $ 194.2 $ 375.5 $ 359.8
Less: allocation of earnings to participating nonvested stock and stock unit awards - basic 7.2 9.0 16.3 16.7
Less: allocation of earnings to participating nonvested stock and stock unit awards - diluted 7.2 9.0 16.3 16.7
Net Income Available to Common Stockholders - basic 117.0 185.2 359.2 343.1
Net Income Available to Common Stockholders - diluted $ 117.0 $ 185.2 $ 359.2 $ 343.1
Weighted-average shares outstanding – basic 518.4 490.7 502.6 490.1
Dilutive effect of nonparticipating nonvested stock unit awards 0.8 0.7 0.8 0.7
Weighted-Average Shares Outstanding – Diluted 519.2 491.4 503.4 490.8
Earnings per Share [Abstract]        
Basic $ 0.23 $ 0.38 $ 0.71 $ 0.70
Diluted $ 0.23 $ 0.38 $ 0.71 $ 0.70