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Fair Value Measurements - Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset | [1] | $ 427.8 | $ 522.9
Derivative liability | [1] | 410.9 | 468.7
Total, inventories liability |  |  | 14.3
Level 1 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Subtotal Assets |  | 236.1 | 255.4
Subtotal Liabilities |  | 279.2 | 340.1
Level 2 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Subtotal Assets |  | 192.1 | 266.7
Inventories liability |  |  | 14.3
Subtotal Liabilities |  | 131.4 | 142.7
Assets and liabilities measured at estimated fair value on a nonrecurring basis |  |  |
Fair value of inventory disposal group |  | 4.5 |
Level 3 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Subtotal Assets |  | 3.0 | 3.2
Subtotal Liabilities |  | 0.3 | 0.2
Assets and liabilities measured at estimated fair value on a nonrecurring basis |  |  |
Fair value of asset disposal group, excluding inventory |  | 34.7 |
Fair value of liability disposal group |  | 10.6 |
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 |  | 431.1 | 525.3
Netting and collateral, asset |  | (286.9) | (283.1)
Total Assets |  | 144.2 | 242.2
Inventories liability |  |  | 14.3
Subtotal Liabilities |  | 410.9 | 483.0
Netting and collateral, liability |  | (345.9) | (393.7)
Total Liabilities |  | 65.1 | 89.3
Fair value measured on recurring basis | Level 3 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Debt | [2] | 805.2 | 772.2
Notes receivable |  | 6.1 | 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] | 139.5 | 231.5
Total, derivative liability | [2] | 61.3 | 74.1
Commodity contracts | Level 1 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset |  | 236.1 | 255.4
Derivative liability |  | 279.2 | 340.1
Commodity contracts | Level 2 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset |  | 178.7 | 251.9
Derivative liability |  | 119.0 | 123.4
Commodity contracts | Level 3 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset |  | 3.0 | 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 |  | 417.7 | 510.5
Netting and collateral, derivative asset |  | (278.2) | (279.0)
Total, derivative asset |  | 139.5 | 231.5
Derivative liability |  | 398.5 | 463.7
Netting and collateral, derivative liability |  | (337.2) | (389.6)
Total, derivative liability |  | 61.3 | 74.1
Foreign currency contracts |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Total, derivative asset | [2] | 1.4 | 8.3
Total, derivative liability | [2] | 3.7 | 0.9
Foreign currency contracts | Level 2 |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |
Derivative asset |  | 10.1 | 12.4
Derivative liability |  | 12.4 | 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 |  | 10.1 | 12.4
Netting and collateral, derivative asset |  | (8.7) | (4.1)
Total, derivative asset |  | 1.4 | 8.3
Derivative liability |  | 12.4 | 5.0
Netting and collateral, derivative liability |  | (8.7) | (4.1)
Total, derivative liability |  | $ 3.7 | $ 0.9
[1] | Amounts may not add due to rounding
[2] | Amounts may not add due to rounding

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