Derivative Financial Instruments and Hedging Activities - Schedule of Notional Amounts (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional amount	$ 16,103.6	$ 16,925.4
Swaps
Derivative [Line Items]
Notional amount	567.0	684.5
Futures, forwards and spot
Derivative [Line Items]
Notional amount	4,558.7	5,467.8
Written options
Derivative [Line Items]
Notional amount	5,764.6	5,578.1
Purchased options
Derivative [Line Items]
Notional amount	$ 5,213.3	$ 5,195.0