Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Gross Amounts Recognized	$ 565.4	$ 378.5
Gross Amounts Offset	442.3	294.6
Net Amounts Presented	123.1	83.9
Cash Collateral	5.4	1.2
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	117.7	82.7
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	576.0	349.5
Gross Amounts Offset	442.3	294.6
Net Amounts Presented	133.8	54.9
Cash Collateral	3.1	2.3
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	130.6	52.6
Commodity contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	559.0	371.0
Gross Amounts Offset	439.0	287.1
Net Amounts Presented	119.9	83.9
Cash Collateral	5.4	1.2
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	114.5	82.7
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	570.0	326.0
Gross Amounts Offset	439.0	287.1
Net Amounts Presented	131.0	38.9
Cash Collateral	3.1	2.3
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	127.9	36.6
Interest rate contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	2.3
Gross Amounts Offset	0.0
Net Amounts Presented	2.3
Cash Collateral	0.0
Gross Amounts without Right of Offset	0.0
Net Amounts	2.3
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	1.3	3.7
Gross Amounts Offset	0.0	0.0
Net Amounts Presented	1.3	3.7
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	1.3	3.7
Foreign currency contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	4.1	7.5
Gross Amounts Offset	3.2	7.5
Net Amounts Presented	0.9	0.0
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	0.9	0.0
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	4.7	19.8
Gross Amounts Offset	3.2	7.5
Net Amounts Presented	1.5	12.3
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	$ 1.5	$ 12.3

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