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Selected Balance Sheet Data (Tables)
 3 Months Ended
Mar. 31, 2020
Balance Sheet Related Disclosures [Abstract]  
Accounts Receivable, Net
(Millions of Dollars)
 
March 31, 2020
 
Dec. 31, 2019
Accounts receivable, net
 
 
 
 
Accounts receivable
 
$
337.4

 
$
324.9

Less allowance for bad debts
 
(22.5
)
 
(21.0
)
Accounts receivable, net
 
$
314.9

 
$
303.9
Inventories
(Millions of Dollars)
 
March 31, 2020
 
Dec. 31, 2019
Inventories
 
 
 
 
Materials and supplies
 
$
62.5

 
$
62.6

Fuel
 
64.4

 
77.1

Natural gas
 
26.6

 
52.3

Total inventories
 
$
153.5

 
$
192.0
Property, plant and equipment, net
(Millions of Dollars)
 
March 31, 2020
 
Dec. 31, 2019
Property, plant and equipment, net
 
 
 
 
Electric plant
 
$
14,449.3

 
$
14,361.9

Natural gas plant
 
4,703.8

 
4,631.4

Common and other property
 
1,132.4

 
1,113.5

Plant to be retired (a)
 
216.5

 
259.9

Construction work in progress
 
1,061.7

 
912.7

Total property, plant and equipment
 
21,563.7

 
21,279.4

Less accumulated depreciation
 
(4,934.1
)
 
(5,124.4
)
Property, plant and equipment, net
 
$
16,629.6

 
$
16,155.0


(a) 
In 2018, the CPUC approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively. PSCo also expects Craig Unit 1 to be retired early in 2025. Amounts are presented net of accumulated depreciation.