Derivatives - Balance Sheet Location (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	$ 191.0	$ 347.2
Derivative liabilities	155.8	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	35.5	93.3
Derivative liabilities	30.8	108.9
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	35.5	2.2
Derivative liabilities	30.8	5.4
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	0.0	86.0
Derivative liabilities	0.0	93.5
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
Derivative assets	0.0	5.1
Derivative liabilities	0.0	10.1
Derivatives not designated as hedging instruments
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	14.8	16.0
Derivative liabilities	10.8	6.4
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	140.8	238.0
Derivative liabilities	114.2	217.2
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	111.5	160.3
Derivative liabilities	69.8	86.7
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	14.8	17.1
Derivative liabilities	7.0	6.2
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	10.0	52.5
Derivative liabilities	30.2	112.2
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	4.4	8.1
Derivative liabilities	7.3	12.1
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	14.6	13.5
Derivative liabilities	10.8	3.4
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	0.2	0.9
Derivative liabilities	0.0	0.1
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	0.0	1.6
Derivative liabilities	$ 0.0	$ 2.8