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Transactions with Major Customers and Affiliates (Tables)
12 Months Ended
Dec. 31, 2019
Transactions with Major Customers and Affiliates [Abstract]  
Schedule of revenue by major customers
Operating revenues received from three of our major customers in 2019, 2018 and 2017 are as follows (in millions): 
 
2019
 
2018
 
2017
Dominion Energy, Inc.
$
250.7

 
$
113.5

 
$
72.0

Duke Energy Corporation
222.5

 
194.5

 
198.4

The Southern Company, Inc.
216.1


166.2


160.0