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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 ending December 31 (in millions):
 
2019
 
2018
 
2017
Net disposition gains
$
58.6

 
$
64.8

 
$
44.1

Residual sharing income
1.9

 
2.5

 
10.2

Non-remarketing net disposition gains
8.2

 
14.5

 
8.4

Asset impairment losses (1)
(6.6
)
 
(9.0
)
 
(8.6
)
Net Gain on Asset Dispositions
$
62.1

 
$
72.8

 
$
54.1


__________
(1) See "Note 9. Asset Impairments and Assets Held for Sale" for further information about asset impairment losses.