Operating Assets and Facilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 13,675.9		$ 13,675.9		$ 13,081.9
Less: allowance for depreciation	(3,764.1)		(3,764.1)		(3,670.7)
Operating assets and facilities, net	9,911.8		9,911.8		9,411.2
Total depreciation expense	103.0	$ 95.9	203.5	$ 189.4
Railcars and locomotives
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	12,233.7		12,233.7		11,700.8
Aircraft spare engines
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	841.0		841.0		769.7
Tank containers
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	244.7		244.7		237.7
Buildings, leasehold improvements, and other equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	252.4		252.4		253.0
Other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 104.1		$ 104.1		$ 120.7