Operating Assets and Facilities (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Operating Assets and Facilities

The following table shows the components of our operating assets and facilities as of December 31 (in millions):

	2023		2022
Railcars and locomotives	$	11,700.8	$	10,654.9
Aircraft spare engines	769.7		502.4
Tank containers	237.7		200.8
Buildings, leasehold improvements, and other equipment	253.0		194.5
Other	120.7		122.4
	$	13,081.9	$	11,675.0
Less: allowance for depreciation	(3,670.7)		(3,424.7)
Net operating assets and facilities	$	9,411.2	$	8,250.3

The following table shows the components of our total depreciation expense for the years ended December 31 (in millions):

	2023		2022		2021
Operating assets and facilities, included in depreciation expense	$	376.3	$	357.5	$	364.4
Maintenance operating assets and facilities, included in maintenance expense	9.3		7.5		7.2
Depreciation on operating assets and facilities	385.6		365.0		371.6
Non-operating assets, included in SG&A	5.9		6.3		6.8
Total depreciation expense	$	391.5	$	371.3	$	378.4