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Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  |  | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Sep. 30, 2013 Foreign Currency Derivatives [Member] | Mar. 31, 2014 Refined Oil Products [Member] Commodity Derivative Contracts [Member] | Mar. 31, 2014 Minimum [Member] Foreign Currency Derivatives [Member] | Mar. 31, 2014 Minimum [Member] Commodity Derivative Contracts [Member] | Mar. 31, 2014 Maximum [Member] Foreign Currency Derivatives [Member] | Mar. 31, 2014 Maximum [Member] Commodity Derivative Contracts [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Outstanding derivative swap contracts |  |  |  |  | $ 23.2 |  |  |  |
Notional amounts of foreign currency derivatives |  |  |  | 151.0 |  |  |  |  |
Derivative maturities |  |  |  |  |  | April 2014 | April 2014 | December 2014 | June 2014
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net | 18.6 |  | 25.2 |  |  |  |  |  |
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax | $ 0.1 | $ 1.6 |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Amount of gain (loss) from the ineffectiveness of the hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Net fair value of all derivatives designated as hedges of net investment in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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