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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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):
 
2018
 
2017
 
2016
Net disposition gains
$
64.8

 
$
44.1

 
$
49.7

Residual sharing income
2.5

 
10.2

 
83.6

Non-remarketing net disposition gains
14.5

 
8.4

 
3.2

Asset impairment losses (1)
(9.0
)
 
(8.6
)
 
(38.5
)
Net Gain on Asset Dispositions
$
72.8

 
$
54.1

 
$
98.0