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Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Offsetting Assets [Line Items]
Gross Amounts Recognized	$ 395.0	$ 845.8
Gross Amounts Offset	338.0	647.0
Net Amounts Presented	57.0	198.8
Cash Collateral	0.0	3.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	57.0	195.8
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	398.7	769.1
Gross Amounts Offset	338.0	647.0
Net Amounts Presented	60.7	122.2
Cash Collateral	19.4	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	41.3	122.2
Commodity contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	393.0	841.2
Gross Amounts Offset	335.9	646.0
Net Amounts Presented	57.0	195.1
Cash Collateral	0.0	3.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	57.0	192.1
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	394.8	767.9
Gross Amounts Offset	335.9	646.0
Net Amounts Presented	58.9	121.9
Cash Collateral	19.4	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	39.5	121.9
Foreign currency contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	2.1	4.6
Gross Amounts Offset	2.1	0.9
Net Amounts Presented	0.0	3.7
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	0.0	3.7
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	3.8	1.2
Gross Amounts Offset	2.1	0.9
Net Amounts Presented	1.7	0.3
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	$ 1.7	$ 0.3

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