XML 30 R20.htm IDEA: XBRL DOCUMENT v3.20.2
Selected Balance Sheet Data (Tables)
 6 Months Ended
Jun. 30, 2020
Balance Sheet Related Disclosures [Abstract]  
Accounts Receivable, Net
(Millions of Dollars)June 30, 2020Dec. 31, 2019
Accounts receivable, net
Accounts receivable$308.2  $324.9  
Less allowance for bad debts(23.9) (21.0) 
Accounts receivable, net$284.3  $303.9  
Inventories
(Millions of Dollars)June 30, 2020Dec. 31, 2019
Inventories
Materials and supplies$62.8  $62.6  
Fuel67.2  77.1  
Natural gas24.1  52.3  
Total inventories$154.1  $192.0  
Property, Plant and Equipment, Net
(Millions of Dollars)June 30, 2020Dec. 31, 2019
Property, plant and equipment, net
Electric plant$14,601.5  $14,361.9  
Natural gas plant4,778.1  4,631.4  
Common and other property1,133.3  1,113.5  
Plant to be retired (a)
291.5  259.9  
Construction work in progress1,251.8  912.7  
Total property, plant and equipment22,056.2  21,279.4  
Less accumulated depreciation(5,128.4) (5,124.4) 
Property, plant and equipment, net$16,927.8  $16,155.0