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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

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