Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Gross Amounts Recognized	$ 765.3	$ 378.5
Gross Amounts Offset	502.9	294.6
Net Amounts Presented	262.4	83.9
Cash Collateral	106.0	1.2
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	156.5	82.7
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	783.1	349.5
Gross Amounts Offset	502.9	294.6
Net Amounts Presented	280.2	54.9
Cash Collateral	3.3	2.3
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	276.9	52.6
Commodity contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	758.4	371.0
Gross Amounts Offset	499.2	287.1
Net Amounts Presented	259.2	83.9
Cash Collateral	106.0	1.2
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	153.3	82.7
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	777.8	326.0
Gross Amounts Offset	499.2	287.1
Net Amounts Presented	278.7	38.9
Cash Collateral	3.3	2.3
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	275.4	36.6
Interest rate contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	2.4
Gross Amounts Offset	0.0
Net Amounts Presented	2.4
Cash Collateral	0.0
Gross Amounts without Right of Offset	0.0
Net Amounts	2.4
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	4.5	7.5
Gross Amounts Offset	3.7	7.5
Net Amounts Presented	0.8	0.0
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	0.8	0.0
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	4.0	19.8
Gross Amounts Offset	3.7	7.5
Net Amounts Presented	0.3	12.3
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	$ 0.3	$ 12.3

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