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Commitments and Contingencies - Bonds, Leases, and Sales and Purchase Commitments (Details) bbl in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) bbl | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Surety Bonds |  |  |
Outstanding bonds | $ 44.6 | $ 52.8 |
Future minimum lease payments under non-cancelable operating leases |  |  |
2018 | 39.7 |  |
2019 | 31.0 |  |
2020 | 25.7 |  |
2021 | 21.3 |  |
2022 | 15.1 |  |
Thereafter | 32.4 |  |
Total future minimum lease payment | 165.2 |  |
Rental expenses for properties and equipment | 40.3 | $ 36.9 | $ 31.6
Minimum sublease rentals due in the future under non-cancelable subleases | 34.7 |  |
Sales and Purchase Commitments |  |  |
Sales commitments under derivative programs | 921.4 |  |
Purchase commitments under derivative programs | $ 516.4 |  |
Minimum | Aviation Fuel |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Minimum purchase required (in barrels) | bbl | 1,720 |  |
Maximum | Aviation Fuel |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Minimum purchase required (in barrels) | bbl | 2,000 |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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