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Fair Value Measurements - Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset | [1] | $ 355.1 | $ 522.9
Derivative liability | [1] | 348.3 | 468.7
Total, inventories liability |  |  | 14.3
Level 1 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Subtotal Assets |  | 213.6 | 255.4
Subtotal Liabilities |  | 220.9 | 340.1
Level 2 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Subtotal Assets |  | 144.3 | 266.7
Inventories liability |  |  | 14.3
Subtotal Liabilities |  | 127.1 | 142.7
Level 3 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Subtotal Assets |  | 0.5 | 3.2
Subtotal Liabilities |  | 0.3 | 0.2
Cash surrender value of life insurance |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Investments |  | 3.3 | 2.4
Cash surrender value of life insurance | Level 2 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Investments |  | 3.3 | 2.4
Fair value measured on recurring basis |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Subtotal Assets |  | 358.4 | 525.3
Netting and collateral, asset |  | (296.5) | (283.1)
Total Assets |  | 61.9 | 242.2
Inventories liability |  |  | 14.3
Subtotal Liabilities |  | 348.3 | 483.0
Netting and collateral, liability |  | (304.7) | (393.7)
Total Liabilities |  | 43.6 | 89.3
Fair value measured on recurring basis | Level 3 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Debt | [2] | 796.5 | 772.2
Notes receivable |  | 7.4 | 7.4
Fair value measured on recurring basis | Cash surrender value of life insurance |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Investments |  | 3.3 | 2.4
Commodity contracts |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Total, derivative asset | [2] | 50.1 | 231.5
Total, derivative liability | [2] | 41.7 | 74.1
Commodity contracts | Level 1 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset |  | 213.6 | 255.4
Derivative liability |  | 220.9 | 340.1
Commodity contracts | Level 2 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset |  | 123.6 | 251.9
Derivative liability |  | 116.3 | 123.4
Commodity contracts | Level 3 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset |  | 0.5 | 3.2
Derivative liability |  | 0.3 | 0.2
Commodity contracts | Fair value measured on recurring basis |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset |  | 337.7 | 510.5
Netting and collateral, derivative asset |  | (287.6) | (279.0)
Total, derivative asset |  | 50.1 | 231.5
Derivative liability |  | 337.5 | 463.7
Netting and collateral, derivative liability |  | (295.8) | (389.6)
Total, derivative liability |  | 41.7 | 74.1
Foreign currency contracts |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Total, derivative asset | [2] | 8.5 | 8.3
Total, derivative liability | [2] | 1.8 | 0.9
Foreign currency contracts | Level 2 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset |  | 17.4 | 12.4
Derivative liability |  | 10.8 | 5.0
Foreign currency contracts | Fair value measured on recurring basis |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset |  | 17.4 | 12.4
Netting and collateral, derivative asset |  | (8.9) | (4.1)
Total, derivative asset |  | 8.5 | 8.3
Derivative liability |  | 10.8 | 5.0
Netting and collateral, derivative liability |  | (8.9) | (4.1)
Total, derivative liability |  | $ 1.9 | $ 0.9
[1] | Amounts may not add due to rounding
[2] | Amounts may not add due to rounding

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