Derivative Instruments - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	$ 765.3	$ 378.5
Gross Derivative Liabilities	783.1	349.5
Commodity contracts
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	758.4	371.0
Gross Derivative Liabilities	777.8	326.0
Interest rate contracts
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	2.4
Gross Derivative Liabilities	1.3	3.7
Foreign currency contracts
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	4.5	7.5
Gross Derivative Liabilities	4.0	19.8
Derivatives designated as hedging instruments
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	40.9	126.0
Gross Derivative Liabilities	93.6	127.2
Derivatives designated as hedging instruments | Commodity contracts | Short-term derivative assets, net
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	38.0	124.9
Gross Derivative Liabilities	90.5	120.7
Derivatives designated as hedging instruments | Commodity contracts | Short-term derivative liabilities, net
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	0.5	1.0
Gross Derivative Liabilities	1.8	2.3
Derivatives designated as hedging instruments | Commodity contracts | Other long-term liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	0.0	0.1
Gross Derivative Liabilities	0.0	0.5
Derivatives designated as hedging instruments | Interest rate contracts | Short-term derivative liabilities, net
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	0.0	0.0
Gross Derivative Liabilities	1.3	1.3
Derivatives designated as hedging instruments | Interest rate contracts | Identifiable intangible and other non-current assets
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	2.4	0.0
Gross Derivative Liabilities	0.0	0.0
Derivatives designated as hedging instruments | Interest rate contracts | Other long-term liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	0.0	0.0
Gross Derivative Liabilities	0.0	2.4
Derivatives not designated as hedging instruments
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	724.4	252.5
Gross Derivative Liabilities	689.5	222.3
Derivatives not designated as hedging instruments | Commodity contracts | Short-term derivative assets, net
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	506.7	164.9
Gross Derivative Liabilities	280.4	102.7
Derivatives not designated as hedging instruments | Commodity contracts | Short-term derivative liabilities, net
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	75.9	30.5
Gross Derivative Liabilities	287.5	68.4
Derivatives not designated as hedging instruments | Commodity contracts | Identifiable intangible and other non-current assets
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	120.3	32.1
Gross Derivative Liabilities	32.5	7.9
Derivatives not designated as hedging instruments | Commodity contracts | Other long-term liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	17.1	17.5
Gross Derivative Liabilities	85.1	23.5
Derivatives not designated as hedging instruments | Foreign currency contracts | Short-term derivative assets, net
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	2.0	0.0
Gross Derivative Liabilities	1.2	0.0
Derivatives not designated as hedging instruments | Foreign currency contracts | Short-term derivative liabilities, net
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	2.3	7.5
Gross Derivative Liabilities	2.7	19.6
Derivatives not designated as hedging instruments | Foreign currency contracts | Identifiable intangible and other non-current assets
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	0.2	0.0
Gross Derivative Liabilities	0.1	0.0
Derivatives not designated as hedging instruments | Foreign currency contracts | Other long-term liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Gross Derivative Assets	0.0	0.0
Gross Derivative Liabilities	$ 0.0	$ 0.2