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Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Offsetting Assets [Line Items]
Gross Amounts Recognized	$ 527.3	$ 845.8
Gross Amounts Offset	465.0	647.0
Net Amounts Presented	62.3	198.8
Cash Collateral	3.3	3.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	59.0	195.8
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	534.3	769.1
Gross Amounts Offset	465.0	647.0
Net Amounts Presented	69.3	122.2
Cash Collateral	14.2	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	55.1	122.2
Commodity contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	524.7	841.2
Gross Amounts Offset	462.8	646.0
Net Amounts Presented	61.9	195.1
Cash Collateral	3.3	3.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	58.6	192.1
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	531.7	767.9
Gross Amounts Offset	462.8	646.0
Net Amounts Presented	68.9	121.9
Cash Collateral	14.2	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	54.8	121.9
Foreign currency contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	2.6	4.6
Gross Amounts Offset	2.2	0.9
Net Amounts Presented	0.4	3.7
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	0.4	3.7
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	2.6	1.2
Gross Amounts Offset	2.2	0.9
Net Amounts Presented	0.4	0.3
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	$ 0.4	$ 0.3

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