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Derivative Financial Instruments - Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations |  |  |  |
Amount of gain (loss) recognized in net income on derivatives | $ (50.5) | $ (16.4) | $ 25.0 | $ (10.7)
Interest rate contracts |  |  |  |
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations |  |  |  |
Amount of gain (loss) recognized in net income on derivatives | (73.5) | 211.1 | 407.0 | 372.5
Foreign exchange contracts |  |  |  |
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations |  |  |  |
Amount of gain (loss) recognized in net income on derivatives | 27.2 | (37.8) | (5.4) | (27.8)
Equity contracts |  |  |  |
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations |  |  |  |
Amount of gain (loss) recognized in net income on derivatives | (27.6) | (2.5) | (38.7) | (93.3)
Credit contracts |  |  |  |
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations |  |  |  |
Amount of gain (loss) recognized in net income on derivatives | 0.3 |  | 1.3 | (3.5)
Other contracts |  |  |  |
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations |  |  |  |
Amount of gain (loss) recognized in net income on derivatives | $ 23.1 | $ (187.2) | $ (339.2) | $ (258.6)

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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