Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Gross Amounts Recognized	$ 423.2	$ 378.5
Gross Amounts Offset	343.4	294.6
Net Amounts Presented	79.8	83.9
Cash Collateral	0.0	1.2
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	79.8	82.7
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	400.6	349.5
Gross Amounts Offset	343.4	294.6
Net Amounts Presented	57.2	54.9
Cash Collateral	2.0	2.3
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	55.1	52.6
Commodity contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	410.9	371.0
Gross Amounts Offset	339.9	287.1
Net Amounts Presented	71.0	83.9
Cash Collateral	0.0	1.2
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	71.0	82.7
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	391.9	326.0
Gross Amounts Offset	339.9	287.1
Net Amounts Presented	52.0	38.9
Cash Collateral	2.0	2.3
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	50.0	36.6
Interest rate contracts
Offsetting Assets [Line Items]
Gross Amounts Recognized	2.8
Gross Amounts Offset	0.0
Net Amounts Presented	2.8
Cash Collateral	0.0
Gross Amounts without Right of Offset	0.0
Net Amounts	2.8
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	9.5	7.5
Gross Amounts Offset	3.5	7.5
Net Amounts Presented	6.0	0.0
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	6.0	0.0
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	7.4	19.8
Gross Amounts Offset	3.5	7.5
Net Amounts Presented	3.9	12.3
Cash Collateral	0.0	0.0
Gross Amounts without Right of Offset	0.0	0.0
Net Amounts	$ 3.9	$ 12.3