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):

	2021		2020		2019
Net disposition gains	$	82.4	$	39.4	$	58.6
Residual sharing income	8.9		2.5		1.9
Non-remarketing net disposition gains (losses)	17.0		0.1		(2.3)
Asset impairment losses (1)	(2.4)		(0.3)		(6.6)
Net Gain on Asset Dispositions	$	105.9	$	41.7	$	51.6

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