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Business and Basis of Presentation - Summary of Effects of Changes in Presentation Cash Flows (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Net cash provided by/(used in) Operating activities $ 522.4 $ 686.0
Net cash provided by/(used in) Investing activities 366.7 192.6 [1]
Net cash provided by/(used in) Financing activities (890.3) (883.8) [2]
Net change in cash and cash equivalents, including settlement, and restricted cash $ (1.2) (5.2)
As Previously Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Net cash provided by/(used in) Operating activities [3]   686.0
Net cash provided by/(used in) Investing activities [1],[3]   (332.9)
Net cash provided by/(used in) Financing activities [2],[3]   (745.5)
Net change in cash and cash equivalents, including settlement, and restricted cash [3]   (392.4)
Revisions    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Net cash provided by/(used in) Investing activities [1]   525.5
Net cash provided by/(used in) Financing activities [2]   (138.3)
Net change in cash and cash equivalents, including settlement, and restricted cash   $ 387.2
[1] The financial statement lines included in Investing activities are Purchases of settlement investments, Proceeds from the sale of settlement investments, and Maturities of settlement investments.
[2] The financial statement line included in Financing activities is Net change in settlement obligations.
[3] As reported in the Company's Form 10-Q filed with the Securities Exchange Commission on November 2, 2021.