Operating Assets and Facilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 13,081.9	$ 11,675.0
Less: allowance for depreciation	(3,670.7)	(3,424.7)
Operating assets and facilities, net	9,411.2	8,250.3
Total depreciation expense	391.5	371.3	$ 378.4
Railcars and locomotives
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	11,700.8	10,654.9
Aircraft spare engines
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	769.7	502.4
Tank containers
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	237.7	200.8
Buildings, leasehold improvements, and other equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	253.0	194.5
Other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	120.7	122.4
Operating Assets and Facilities
Property, Plant and Equipment [Line Items]
Total depreciation expense	$ 385.6	$ 365.0	$ 371.6