Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Net gain on disposition of assets

The following table presents the net gain on asset dispositions for the years ended December 31 (in millions):

	2023		2022		2021
Net disposition gains	$	119.8	$	104.1	$	82.4
Residual sharing income	0.9		5.6		8.9
Non-remarketing net disposition gains	11.1		17.1		17.0
Asset impairments (1)	(1.5)		(48.9)		(2.4)
Net gain on asset dispositions	$	130.3	$	77.9	$	105.9

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(1) See "Note 10. Asset Impairments and Assets Held for Sale" for further information about asset impairment losses.