Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended				9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2013 Foreign Currency Derivatives [Member]	Sep. 30, 2014 Refined Oil Products [Member] Commodity Derivative Contracts [Member]	Sep. 30, 2014 Minimum [Member] Foreign Currency Derivatives [Member]	Sep. 30, 2014 Minimum [Member] Commodity Derivative Contracts [Member]	Sep. 30, 2014 Maximum [Member] Foreign Currency Derivatives [Member]	Sep. 30, 2014 Maximum [Member] Commodity Derivative Contracts [Member]
Derivative [Line Items]
Outstanding derivative swap contracts					$ 11.6
Notional amounts of foreign currency derivatives				124.2
Derivative maturities						October 2014	October 2014	September 2015	December 2014
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net	11.5		25.2
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax	$ 0.7	$ 0.2