Commitments and Contingencies - Narrative (Details)		1 Months Ended			12 Months Ended
	Jun. 01, 2018 USD ($)	Jun. 30, 2018 defendant	Mar. 31, 2016 party mi	May 31, 2007 claim entity	Dec. 31, 2019 USD ($) mi
Operating Leased Assets [Line Items]
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				3,000,000
Number of consolidated class action lawsuits | claim				1
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
Number of defendants | defendant		110
Minimum | Pending Litigation
Operating Leased Assets [Line Items]
Range of possible loss from legal proceedings					$ 1,000,000
Maximum | Pending Litigation
Operating Leased Assets [Line Items]
Range of possible loss from legal proceedings					$ 29,000,000
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