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Acquisitions - Gain Capital Holdings Inc Post Acquisition Results and Unaudited Pro Forma Information (Details) - Gain Capital Holdings Inc $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2020 USD ($) $ / shares
Business Acquisition, Pro Forma Information [Abstract] |
Total revenues | $ | $ 54,414.1
Net income | $ | $ 138.5
Basic earnings per share (in dollars per share) | $ / shares | $ 7.17
Diluted earnings per share (in dollars per share) | $ / shares | $ 7.02

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