Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended				6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Commodity Price Risk [Member]	Dec. 31, 2012 Commodity Price Risk [Member]	Jun. 30, 2013 Foreign Exchange Contracts [Member] Sales And Purchases [Member]	Dec. 31, 2012 Foreign Exchange Contracts [Member] Sales And Purchases [Member]	Jun. 30, 2013 Not Designated As Hedging Instrument [Member]	Jun. 30, 2012 Not Designated As Hedging Instrument [Member]	Jun. 30, 2013 Not Designated As Hedging Instrument [Member]	Jun. 30, 2012 Not Designated As Hedging Instrument [Member]
Derivative [Line Items]
Maximum length of time hedged in cash flow hedge			24 months		15 months
Notional amount			$ 15.7	$ 21.5	$ 126.3	$ 129.7
Gain recognized in income for derivative instruments							0	0.6	0	0
Gains or losses excluded from assessment of hedge effectiveness	0	0
Cash collateral posted or received for derivative transactions	$ 0