Derivative Financial Instruments and Hedging Activities - Schedule of Notional Amounts (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional amount	$ 25,924.5	$ 16,925.4
Swaps
Derivative [Line Items]
Notional amount	1,316.5	684.5
Futures, forwards and spot
Derivative [Line Items]
Notional amount	7,287.8	5,467.8
Written options
Derivative [Line Items]
Notional amount	9,004.2	5,578.1
Purchased options
Derivative [Line Items]
Notional amount	$ 8,316.0	$ 5,195.0