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Acquisitions - Gain Capital Holdings Inc Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 26, 2020
Sep. 30, 2020
Mar. 31, 2019
Sep. 30, 2020
Sep. 01, 2020
Preliminary Purchase Price Allocation          
Bargain purchase gain   $ 81.8 $ 5.4    
Acquired finite-lived intangible asset, weighted average useful life       1 year  
Gain Capital Holdings Inc [Member]          
Preliminary Purchase Price Allocation          
Cash and cash equivalents $ 507.2        
Cash, securities and other assets segregated under federal and other regulations 497.4        
Deposits with and receivables from broker-dealers, clearing organizations, and counterparties 249.7        
Receivables from clients, net 2.0        
Income taxes receivable 0.4        
Deferred income taxes, net 23.0        
Property and equipment, net 6.1        
Right of use assets, net 15.0        
Other assets 17.9        
Total fair value of tangible assets acquired 1,318.7        
Accounts payable and other accrued liabilities 52.7        
Operating lease liabilities 15.0        
Payable to clients 863.4        
Payable to broker-dealers, clearing organizations, and counterparties 0.5        
Income taxes payable 12.4        
Convertible senior notes 92.0        
Total fair value of tangible liabilities assumed 1,036.0        
Fair value of tangible net assets acquired (4) 282.7        
Identifiable intangible assets acquired 35.7        
Fair value of identifiable net assets acquired 318.4        
Total merger consideration 236.6        
Bargain purchase gain 81.8        
Business combination, convertible senior notes redeemed amount         $ 91.5
Gain Capital Holdings Inc [Member] | Trademarks /Domain Names [Member]          
Preliminary Purchase Price Allocation          
Identifiable intangible assets acquired $ 3.7        
Acquired finite-lived intangible asset, weighted average useful life 5 years        
Gain Capital Holdings Inc [Member] | Software Programs/Platforms [Member]          
Preliminary Purchase Price Allocation          
Identifiable intangible assets acquired $ 22.2        
Acquired finite-lived intangible asset, weighted average useful life 3 years        
Gain Capital Holdings Inc [Member] | Customer base [Member]          
Preliminary Purchase Price Allocation          
Identifiable intangible assets acquired $ 9.8        
Acquired finite-lived intangible asset, weighted average useful life 4 years