Commitments and Contingencies - Narrative (Details)	1 Months Ended			12 Months Ended
	Jun. 30, 2018 defendant	Mar. 31, 2016 party mi	May 31, 2007 entity claim	Dec. 31, 2020 USD ($) mi	Dec. 31, 2019 USD ($)
Operating Leased Assets [Line Items]
Casualty and catastrophic property deductible				$ 100,000,000	$ 50,000,000
Non-catastrophic property deductible				$ 75,000,000	$ 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
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				24,000,000
Casualty | Maximum
Operating Leased Assets [Line Items]
Self-insured retention amount per occurrence				$ 75,000,000