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Fair Value Measurements - Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Gross derivative assets | $ 765.3 | $ 378.5
Liabilities: |  |
Gross derivative liabilities | 783.1 | 349.5
Fair value measured on recurring basis |  |
Assets: |  |
Total assets at fair value | 779.4 | 389.9
Liabilities: |  |
Total liabilities at fair value | 783.1 | 349.5
Fair value measured on recurring basis | Level 1 Inputs |  |
Assets: |  |
Total assets at fair value | 431.3 | 233.5
Liabilities: |  |
Total liabilities at fair value | 326.1 | 223.0
Fair value measured on recurring basis | Level 2 Inputs |  |
Assets: |  |
Total assets at fair value | 346.0 | 146.8
Liabilities: |  |
Total liabilities at fair value | 454.4 | 120.2
Fair value measured on recurring basis | Level 3 Inputs |  |
Assets: |  |
Total assets at fair value | 2.1 | 9.5
Liabilities: |  |
Total liabilities at fair value | 2.6 | 6.3
Commodity contracts | Fair value measured on recurring basis |  |
Assets: |  |
Gross derivative assets | 758.4 | 371.0
Liabilities: |  |
Gross derivative liabilities | 777.8 | 326.0
Commodity contracts | Fair value measured on recurring basis | Level 1 Inputs |  |
Assets: |  |
Gross derivative assets | 431.3 | 233.5
Liabilities: |  |
Gross derivative liabilities | 326.1 | 223.0
Commodity contracts | Fair value measured on recurring basis | Level 2 Inputs |  |
Assets: |  |
Gross derivative assets | 325.0 | 127.9
Liabilities: |  |
Gross derivative liabilities | 449.1 | 96.8
Commodity contracts | Fair value measured on recurring basis | Level 3 Inputs |  |
Assets: |  |
Gross derivative assets | 2.1 | 9.5
Liabilities: |  |
Gross derivative liabilities | 2.6 | 6.3
Foreign currency contracts | Fair value measured on recurring basis |  |
Assets: |  |
Gross derivative assets | 4.5 | 7.5
Liabilities: |  |
Gross derivative liabilities | 4.0 | 19.8
Foreign currency contracts | Fair value measured on recurring basis | Level 1 Inputs |  |
Assets: |  |
Gross derivative assets | 0.0 | 0.0
Liabilities: |  |
Gross derivative liabilities | 0.0 | 0.0
Foreign currency contracts | Fair value measured on recurring basis | Level 2 Inputs |  |
Assets: |  |
Gross derivative assets | 4.5 | 7.5
Liabilities: |  |
Gross derivative liabilities | 4.0 | 19.8
Foreign currency contracts | Fair value measured on recurring basis | Level 3 Inputs |  |
Assets: |  |
Gross derivative assets | 0.0 | 0.0
Liabilities: |  |
Gross derivative liabilities | 0.0 | 0.0
Interest rate contracts | Fair value measured on recurring basis |  |
Assets: |  |
Gross derivative assets | 2.4 |
Liabilities: |  |
Gross derivative liabilities | 1.3 | 3.7
Interest rate contracts | Fair value measured on recurring basis | Level 1 Inputs |  |
Assets: |  |
Gross derivative assets | 0.0 |
Liabilities: |  |
Gross derivative liabilities | 0.0 | 0.0
Interest rate contracts | Fair value measured on recurring basis | Level 2 Inputs |  |
Assets: |  |
Gross derivative assets | 2.4 |
Liabilities: |  |
Gross derivative liabilities | 1.3 | 3.7
Interest rate contracts | Fair value measured on recurring basis | Level 3 Inputs |  |
Assets: |  |
Gross derivative assets | 0.0 |
Liabilities: |  |
Gross derivative liabilities | 0.0 | 0.0
Cash surrender value of life insurance | Fair value measured on recurring basis |  |
Assets: |  |
Cash surrender value of life insurance | 14.1 | 11.4
Cash surrender value of life insurance | Fair value measured on recurring basis | Level 1 Inputs |  |
Assets: |  |
Cash surrender value of life insurance | 0.0 | 0.0
Cash surrender value of life insurance | Fair value measured on recurring basis | Level 2 Inputs |  |
Assets: |  |
Cash surrender value of life insurance | 14.1 | 11.4
Cash surrender value of life insurance | Fair value measured on recurring basis | Level 3 Inputs |  |
Assets: |  |
Cash surrender value of life insurance | $ 0.0 | $ 0.0

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