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Other Income, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Other Income and Expenses [Abstract]  
Schedule of other income, net

Total other income, net was as follows for the years ended December 31:
(in millions)
 
2019
 
2018
 
2017
AFUDC – Equity
 
$
3.7

 
$
3.9

 
$
3.1

Non-service credit (cost) components of net periodic benefit costs
 
9.2

 
5.7

 
(6.5
)
Interest income
 
2.2

 
2.2

 
2.3

Other, net
 
7.6

 
8.4

 
14.3

Other income, net
 
$
22.7

 
$
20.2

 
$
13.2