Derivatives - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	$ 268.8	$ 522.9
Derivative liabilities	276.3	468.7
Derivatives designated as hedging instruments
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	65.2	127.7
Derivative liabilities	81.7	98.2
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
Derivative assets	8.9	114.0
Derivative liabilities	6.8	95.3
Derivatives 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	0.1	7.4
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	56.1	6.3
Derivative liabilities	74.8	2.9
Derivatives not designated as hedging instruments
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	203.6	395.2
Derivative liabilities	194.6	370.5
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	34.4	241.4
Derivative liabilities	7.6	26.6
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	37.1	17.0
Derivative liabilities	21.8	4.8
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	118.9	120.4
Derivative liabilities	152.0	319.9
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
Derivative assets	1.6	4.0
Derivative liabilities	6.8	14.2
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	9.1	10.9
Derivative liabilities	3.4	3.3
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
Derivative assets	1.4	0.7
Derivative liabilities	0.1	0.0
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	1.1	0.8
Derivative liabilities	$ 3.0	$ 1.7