Derivatives - Balance Sheet Location (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	$ 533.9	$ 312.0
Derivative liabilities	549.2	332.5
Derivatives designated as hedging instruments
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	30.9	2.7
Derivative liabilities	49.2	43.6
Derivatives designated as hedging instruments | Commodity contracts
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	23.9	2.7
Derivative liabilities	45.5	43.6
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
Derivative assets	23.9	0.4
Derivative liabilities	45.5	0.5
Derivatives designated as hedging instruments | Commodity contracts | Accrued expenses and other current liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	0.0	2.3
Derivative liabilities	0.1	43.1
Derivatives designated as hedging instruments | Foreign currency contracts
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	7.1	0.0
Derivative liabilities	3.6	0.0
Derivatives 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
Derivative assets	7.1	0.0
Derivative liabilities	2.4	0.0
Derivatives designated as hedging instruments | Foreign currency contracts | Accrued expenses and other current liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	0.0	0.0
Derivative liabilities	1.2	0.0
Derivatives not designated as hedging instruments
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	503.0	309.4
Derivative liabilities	500.0	288.9
Derivatives not designated as hedging instruments | Commodity contracts
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	491.2	300.9
Derivative liabilities	494.8	280.2
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
Derivative assets	373.4	191.4
Derivative liabilities	292.8	123.3
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
Derivative assets	67.5	18.2
Derivative liabilities	43.4	5.2
Derivatives not designated as hedging instruments | Commodity contracts | Accrued expenses and other current liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	25.6	86.1
Derivative liabilities	114.5	138.2
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
Derivative assets	24.6	5.2
Derivative liabilities	44.2	13.5
Derivatives not designated as hedging instruments | Foreign currency contracts
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	11.8	8.5
Derivative liabilities	5.2	8.7
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
Derivative assets	11.3	4.5
Derivative liabilities	4.5	2.8
Derivatives not designated as hedging instruments | Foreign currency contracts | Accrued expenses and other current liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	0.4	3.9
Derivative liabilities	0.7	5.7
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
Derivative assets	0.0	0.0
Derivative liabilities	$ 0.0	$ 0.2