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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2021
Regulatory Assets and Liabilities Disclosure [Abstract]  
Regulatory Assets
Regulatory assets were comprised of the following items: 
At December 31, (in millions)
20212020
Regulatory Assets
Unrecognized pension and other postretirement benefit costs (see Note 12)
$512.1 $583.3 
Deferred pension and other postretirement benefit costs (see Note 12)
74.8 72.4 
Environmental costs (see Note 19-E)
45.8 56.6 
Regulatory effects of accounting for income taxes (see Note 1-N and Note 11)
194.8 194.5 
Under-recovered gas and fuel costs (see Note 1-J)
73.6 8.0 
Depreciation177.5 192.6 
Post-in-service carrying charges237.9 228.6 
Safety activity costs171.9 146.0 
DSM programs39.2 37.8 
Retired coal generating stations803.9 204.7 
Losses on commodity price risk programs (See Note 10)
9.6 54.7 
Deferred property taxes65.1 62.9 
Renewable energy investments (See Note 1-S and Note 4)
18.5 — 
Other67.5 88.4 
Total Regulatory Assets$2,492.2 $1,930.5 
Less: Current Portion206.2 135.7 
Total Noncurrent Regulatory Assets$2,286.0 $1,794.8 
Regulatory Liabilities
Regulatory liabilities were comprised of the following items: 
At December 31, (in millions)
20212020
Regulatory Liabilities
Over-recovered gas and fuel costs (see Note 1-J)
$5.4 $47.8 
Cost of removal (see Note 8)
749.5 775.2 
Regulatory effects of accounting for income taxes (see Note 1-N and Note 11)
1,040.8 1,105.1 
Deferred pension and other postretirement benefit costs (see Note 12)
75.9 69.5 
Gains on commodity price risk programs (See Note 10)
34.2 14.0 
Other74.2 53.9 
Total Regulatory Liabilities$1,980.0 $2,065.5 
Less: Current Portion137.4 161.3 
Total Noncurrent Regulatory Liabilities$1,842.6 $1,904.2 
Schedule of COVID-19 Regulatory Impact The ongoing impacts of these approvals or directives are described in the table below:
JurisdictionMoratorium in Place?
Regulatory Asset balance as of December 31, 2021
(in millions)
Regulatory Asset balance as of December 31, 2020
(in millions)
Deferred COVID-19 Costs
Columbia of OhioNo$2.1 $2.0 Incremental operation and maintenance expenses
NIPSCONo$2.2 $9.2 Incremental bad debt expense and the costs to implement the requirements of the COVID-19 related order
Columbia of PennsylvaniaNo$5.2 $5.4 
Incremental bad debt expense incurred from March 13, 2020 through December 29, 2021, above levels currently in rates
Columbia of VirginiaNo$1.5 $— 
Incremental incurred costs (including incremental bad debt expense), subject to an earnings test review
Columbia of MarylandNo$0.9 $0.7 
Incremental costs (including incremental bad debt expense) incurred to ensure that customers have essential utility service during the state of emergency in Maryland. Such incremental costs must be offset by any benefit received in connection with the pandemic