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Derivative Financial Instruments - Schedule of Notional Amounts (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Derivative [Line Items] |  |
Derivative, notional amount | $ 16,925.4 | $ 15,841.3
Swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 684.5 | 599.5
Futures, forwards and spot |  |
Derivative [Line Items] |  |
Derivative, notional amount | 5,467.8 | 3,017.1
Written options |  |
Derivative [Line Items] |  |
Derivative, notional amount | 5,578.1 | 6,393.9
Purchased options |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 5,195.0 | $ 5,830.8

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