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Derivative Instruments - Balance Sheet Location (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | $ 312.0 | $ 347.2
Gross Derivative Liabilities | 332.5 | 332.5
Derivatives designated as hedging instruments |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 2.7 | 93.3
Gross Derivative Liabilities | 43.6 | 108.9
Derivatives designated as hedging instruments | Commodity contracts | Short-term derivative assets, net |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 0.4 | 2.2
Gross Derivative Liabilities | 0.5 | 5.4
Derivatives designated as hedging instruments | Commodity contracts | Identifiable intangible and other non-current assets |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 0.0 | 0.0
Gross Derivative Liabilities | 0.0 | 0.0
Derivatives designated as hedging instruments | Commodity contracts | Accrued expenses and other current liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 2.3 | 86.0
Gross Derivative Liabilities | 43.1 | 93.5
Derivatives designated as hedging instruments | Commodity contracts | Other long-term liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 0.0 | 5.1
Gross Derivative Liabilities | 0.0 | 10.1
Derivatives not designated as hedging instruments |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 309.4 | 253.9
Gross Derivative Liabilities | 288.9 | 223.6
Derivatives not designated as hedging instruments | Commodity contracts |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 300.9 | 238.0
Gross Derivative Liabilities | 280.2 | 217.2
Derivatives not designated as hedging instruments | Commodity contracts | Short-term derivative assets, net |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 191.4 | 160.3
Gross Derivative Liabilities | 123.3 | 86.7
Derivatives not designated as hedging instruments | Commodity contracts | Identifiable intangible and other non-current assets |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 18.2 | 17.1
Gross Derivative Liabilities | 5.2 | 6.2
Derivatives not designated as hedging instruments | Commodity contracts | Accrued expenses and other current liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 86.1 | 52.5
Gross Derivative Liabilities | 138.2 | 112.2
Derivatives not designated as hedging instruments | Commodity contracts | Other long-term liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 5.2 | 8.1
Gross Derivative Liabilities | 13.5 | 12.1
Derivatives not designated as hedging instruments | Foreign currency contracts |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 8.5 | 16.0
Gross Derivative Liabilities | 8.7 | 6.4
Derivatives not designated as hedging instruments | Foreign currency contracts | Short-term derivative assets, net |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 4.5 | 13.5
Gross Derivative Liabilities | 2.8 | 3.4
Derivatives not designated as hedging instruments | Foreign currency contracts | Identifiable intangible and other non-current assets |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 0.0 | 0.9
Gross Derivative Liabilities | 0.0 | 0.1
Derivatives not designated as hedging instruments | Foreign currency contracts | Accrued expenses and other current liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 3.9 | 1.6
Gross Derivative Liabilities | 5.7 | $ 2.8
Derivatives not designated as hedging instruments | Foreign currency contracts | Other long-term liabilities |  |
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet |  |
Gross Derivative Assets | 0.0 |
Gross Derivative Liabilities | $ 0.2 |

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