Financial Instruments and Risk Management (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount From Other Comprehensive Earnings (Loss) - Gain (Loss)	$ (10.7)	$ (19.6)	$ (19.2)	$ (37.8)
Gain (Loss) on Derivatives Not Designated As Hedge Instruments	0.2	(9.5)	0.3	(18.0)
Amounts reclassified into earnings:
Commodity contracts	10.0	19.2	17.7	36.2
Interest rate contracts	0.3	0.1	0.8	0.2
Currency exchange contracts	0.4	0.3	0.7	1.4
Change in fair value of cash flow hedges:
Commodity contracts	(1.7)	26.0	(46.1)	8.6
Interest rate contracts	(0.5)	(0.5)	0.4	(1.3)
Currency exchange contracts	(1.4)	(1.1)	1.9	(3.5)
Foreign Currency and tax impacts	(3.4)	(15.3)	1.5	(15.9)
Changes in accumulated other comprehensive earnings (loss) for effective derivatives	3.7	28.7	(23.1)	25.7
Commodity contracts
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount From Other Comprehensive Earnings (Loss) - Gain (Loss)	(10.0)	(19.2)	(17.7)	(36.2)
Gain (Loss) on Derivatives Not Designated As Hedge Instruments	(0.4)		(1.9)	2.2
Interest rate contracts
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount From Other Comprehensive Earnings (Loss) - Gain (Loss)	(0.3)	(0.1)	(0.8)	(0.2)
Foreign currency contracts
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount From Other Comprehensive Earnings (Loss) - Gain (Loss)	(0.4)	(0.3)	(0.7)	(1.4)
Gain (Loss) on Derivatives Not Designated As Hedge Instruments	0.3	(10.2)	3.7	(21.6)
Equity contracts
Impact on Earnings from Derivative Instruments
Gain (Loss) on Derivatives Not Designated As Hedge Instruments	0.3	0.5	(1.5)	1.4
Inflation option contracts
Impact on Earnings from Derivative Instruments
Gain (Loss) on Derivatives Not Designated As Hedge Instruments		$ 0.2