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Commitments and Contingencies - Narrative (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 01, 2018 USD ($) | Mar. 31, 2016 party mi | May 31, 2007 entity | Dec. 31, 2018 USD ($) mi
Operating Leased Assets [Line Items] |  |  |  |
Maximum lease term (up to) |  |  |  | 50 years
Percentage of annual increase in operating lease payments |  |  |  | 2.50%
Number of miles of land and integral equipment leased | mi |  |  |  | 137
Additional lease term |  |  |  | 50 years
Casualty and catastrophic property deductible |  |  |  | $ 50,000,000
Non-catastrophic property deductible |  |  |  | $ 25,000,000
Fuel Surcharge Antitrust Litigation |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Number of other U.S.-based entities mentioned in class action lawsuit | entity |  |  | 3 |
Environmental Litigation |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Number of miles pertaining to Passaic River tidal reach required to be studied by EPA | mi |  |  |  | 17
Number of miles under study | mi |  | 8 |  |
Number of parties participating in allocation process to assign responsibility for costs under study | party |  | 80 |  |
Minimum | Pending Litigation |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Range of possible loss from legal proceedings |  |  |  | $ 3,000,000
Maximum | Pending Litigation |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Range of possible loss from legal proceedings |  |  |  | $ 120,000,000
Casualty Reserves | Minimum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Self-insured retention amount per occurrence | $ 50,000,000 |  |  |
Casualty Reserves | Maximum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Self-insured retention amount per occurrence | $ 75,000,000 |  |  |

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