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Other, Net
 3 Months Ended
Mar. 31, 2020
Other, Net [Abstract]  
Other, Net Other, Net
Three Months Ended March 31, (in millions)
2020
 
2019
Interest income
$
1.7

 
$
2.1

AFUDC equity
1.7

 
1.7

Pension and other postretirement non-service cost
2.7

 
(2.8
)
Miscellaneous
(0.7
)
 
(1.7
)
Total Other, net
$
5.4

 
$
(0.7
)