Derivatives - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	$ 261.8	$ 347.2
Derivative liabilities	251.9	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	42.3	93.3
Derivative liabilities	53.8	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	0.6	2.2
Derivative liabilities	1.0	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	41.6	86.0
Derivative liabilities	52.8	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	219.5	253.9
Derivative liabilities	198.2	223.6
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	214.5	238.0
Derivative liabilities	188.7	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	133.8	160.3
Derivative liabilities	83.4	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	27.4	17.1
Derivative liabilities	16.0	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	46.4	52.5
Derivative liabilities	77.1	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	6.9	8.1
Derivative liabilities	12.1	12.1
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	5.0	16.0
Derivative liabilities	9.5	6.4
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	0.4	13.5
Derivative liabilities	0.2	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	0.0	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	4.6	1.6
Derivative liabilities	9.1	2.8
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	$ 0.2	$ 0.0