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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, 2018 USD ($) bbl | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Surety Bonds |  |  |
Outstanding bonds | $ 73.0 | $ 44.6 |
Future minimum lease payments under non-cancelable operating leases |  |  |
2018 | 50.7 |  |
2019 | 37.1 |  |
2020 | 30.7 |  |
2021 | 23.7 |  |
2022 | 17.8 |  |
Thereafter | 48.5 |  |
Total future minimum lease payment | 208.6 |  |
Rental expenses for properties and equipment | 48.7 | $ 40.3 | $ 36.9
Minimum sublease rentals due in the future under non-cancelable subleases | 42.6 |  |
Sales and Purchase Commitments |  |  |
Sales commitments under derivative programs | 376.7 |  |
Purchase commitments under derivative programs | $ 51.4 |  |
Minimum | Aviation Fuel |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Minimum purchase required (in barrels) | bbl | 1,760 |  |
Maximum | Aviation Fuel |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Minimum purchase required (in barrels) | bbl | 2,020 |  |

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