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Fair Value Measurements - Assets and Liabilities (Details) - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
May 01, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Debt |  |  | $ 1,138.9 |  | $ 772.2 |  |  |
Derivative assets |  |  | 268.8 |  |  |  | $ 522.9 |
Derivative liability |  |  | 276.3 |  |  |  | 468.7 |
Proceeds from sale of business |  | $ 29.3 | 29.3 | [1] | $ 0.0 | [1] |  |
Amount to be received |  | $ 3.0 |  |  |  |  |  |
Level 1 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Inventories asset |  |  | 0.0 |  |  |  |  |
Subtotal assets |  |  | 168.7 |  |  |  | 255.4 |
Inventories liability |  |  |  |  |  |  | 0.0 |
Subtotal liabilities |  |  | 179.4 |  |  |  | 340.1 |
Level 2 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Inventories asset |  |  | 3.1 |  |  |  |  |
Subtotal assets |  |  | 106.5 |  |  |  | 266.7 |
Inventories liability |  |  |  |  |  |  | 14.3 |
Subtotal liabilities |  |  | 100.2 |  |  |  | 142.7 |
Level 3 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Inventories asset |  |  | 0.0 |  |  |  |  |
Subtotal assets |  |  | 0.6 |  |  |  | 3.2 |
Inventories liability |  |  |  |  |  |  | 0.0 |
Subtotal liabilities |  |  | 0.3 |  |  |  | 0.2 |
Cash surrender value of life insurance |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Cash surrender value of life insurance | [1] |  | 3.9 |  |  |  |  |
Cash surrender value of life insurance | Level 1 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Cash surrender value of life insurance |  |  | 0.0 |  |  |  | 0.0 |
Cash surrender value of life insurance | Level 2 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Cash surrender value of life insurance |  |  | 3.9 |  |  |  | 2.4 |
Cash surrender value of life insurance | Level 3 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Cash surrender value of life insurance |  |  | 0.0 |  |  |  | 0.0 |
Fair value measured on recurring basis |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Inventories asset |  |  | 3.1 |  |  |  |  |
Subtotal assets |  |  | 275.8 |  |  |  | 525.3 |
Netting and collateral, asset |  |  | (218.4) |  |  |  | (283.1) |
Total, inventories asset | [1] |  | 3.1 |  |  |  |  |
Total assets | [1] |  | 57.3 |  |  |  | 242.2 |
Inventories liability |  |  |  |  |  |  | 14.3 |
Subtotal liabilities |  |  | 279.9 |  |  |  | 483.0 |
Netting and collateral, liability |  |  | (237.4) |  |  |  | (393.7) |
Total, inventories liability | [1] |  |  |  |  |  | 14.3 |
Total liabilities | [1] |  | 42.4 |  |  |  | 89.3 |
Fair value measured on recurring basis | Level 3 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Debt |  |  | 1,138.9 |  |  |  | 772.2 |
Notes receivable |  |  | 17.4 |  |  |  | 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 |  |  |  |  |  |  |  |
Cash surrender value of life insurance |  |  | 3.9 |  |  |  | 2.4 | [1]
Commodity contracts |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Total, derivative asset |  |  | 43.3 |  |  |  | 231.5 |
Total, derivative liability |  |  | 37.0 |  |  |  | 74.1 |
Commodity contracts | Level 1 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative assets |  |  | 168.7 |  |  |  | 255.4 |
Derivative liability |  |  | 179.4 |  |  |  | 340.1 |
Commodity contracts | Level 2 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative assets |  |  | 87.9 |  |  |  | 251.9 |
Derivative liability |  |  | 90.2 |  |  |  | 123.4 |
Commodity contracts | Level 3 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative assets |  |  | 0.6 |  |  |  | 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 assets |  |  | 257.2 |  |  |  | 510.5 |
Netting and collateral, derivative asset |  |  | (213.8) |  |  |  | (279.0) |
Total, derivative asset | [1] |  | 43.3 |  |  |  | 231.5 |
Derivative liability |  |  | 269.9 |  |  |  | 463.7 |
Netting and collateral, derivative liability |  |  | (232.8) |  |  |  | (389.6) |
Total, derivative liability | [1] |  | 37.0 |  |  |  | 74.1 |
Foreign currency contracts |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Total, derivative asset |  |  | 7.0 |  |  |  | 8.3 |
Total, derivative liability |  |  | 1.9 |  |  |  | 0.9 |
Foreign currency contracts | Level 1 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative assets |  |  | 0.0 |  |  |  | 0.0 |
Derivative liability |  |  | 0.0 |  |  |  | 0.0 |
Foreign currency contracts | Level 2 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative assets |  |  | 11.6 |  |  |  | 12.4 |
Derivative liability |  |  | 6.5 |  |  |  | 5.0 |
Foreign currency contracts | Level 3 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative assets |  |  | 0.0 |  |  |  | 0.0 |
Derivative liability |  |  | 0.0 |  |  |  | 0.0 |
Foreign currency contracts | Fair value measured on recurring basis |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative assets |  |  | 11.6 |  |  |  | 12.4 |
Netting and collateral, derivative asset |  |  | (4.6) |  |  |  | (4.1) |
Total, derivative asset | [1] |  | 7.0 |  |  |  | 8.3 |
Derivative liability |  |  | 6.5 |  |  |  | 5.0 |
Netting and collateral, derivative liability |  |  | (4.6) |  |  |  | (4.1) |
Total, derivative liability | [1] |  | 1.9 |  |  |  | $ 0.9 |
Firm Commitments | Level 1 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative liability |  |  | 0.0 |  |  |  |  |
Firm Commitments | Level 2 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative liability |  |  | 3.5 |  |  |  |  |
Firm Commitments | Level 3 |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative liability |  |  | 0.0 |  |  |  |  |
Firm Commitments | Fair value measured on recurring basis |  |  |  |  |  |  |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |  |  |  |  |  |  |
Derivative liability |  |  | 3.5 |  |  |  |  |
Netting and collateral, derivative liability |  |  | 0.0 |  |  |  |  |
Total, derivative liability | [1] |  | $ 3.5 |  |  |  |  |
[1] | Amounts may not add due to rounding

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