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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2024
Regulatory Assets and Liabilities Disclosure [Abstract]  
Regulatory Assets
Regulatory assets were comprised of the following items:
At December 31, (in millions)
20242023
Regulatory Assets
Unrecognized pension and other postretirement benefit costs (see Note 16)
$485.3 $561.6 
Deferred pension and other postretirement benefit costs (see Note 16)
45.3 59.7 
Environmental costs (see Note 19-D.)
42.8 40.6 
Regulatory effects of accounting for income taxes (see Note 1-N. and Note 15)
172.0 163.5 
Under-recovered gas and fuel costs (see Note 1-J.)
82.3 12.7 
Depreciation214.9 201.9 
Post-in-service carrying charges280.8 269.9 
Safety activity costs203.7 206.6 
DSM programs17.8 25.0 
Retired coal generating stations617.0 682.0 
Losses on commodity price risk programs (See Note 13)
6.5 24.4 
Deferred property taxes75.9 72.3 
Renewable energy investments
81.3 60.8 
WAM system filing
21.5 — 
Customer assistance programs
24.4 — 
Other105.8 79.2 
Total Regulatory Assets$2,477.3 $2,460.2 
Less: Current Portion319.9 214.3 
Total Noncurrent Regulatory Assets$2,157.4 $2,245.9 
Regulatory Liabilities
Regulatory liabilities were comprised of the following items:
At December 31, (in millions)
20242023
Regulatory Liabilities
Over-recovered gas and fuel costs (see Note 1-J.)
$21.4 $144.5 
Cost of removal (see Note 11)
482.8 597.2 
Regulatory effects of accounting for income taxes (see Note 1-N. and Note 15)
827.0 849.9 
Deferred pension and other postretirement benefit costs (see Note 16)
40.4 54.0 
Gains on commodity price risk programs (See Note 13)
28.7 23.3 
Customer assistance programs
9.4 19.8 
Off-system sales sharing
21.4 19.0 
Renewable energy investments (See Note 1-S. and Note 4)
77.0 18.1 
Rate refunds
16.6 16.1 
Other57.0 47.4 
Total Regulatory Liabilities$1,581.7 $1,789.3 
Less: Current Portion150.5 278.6 
Total Noncurrent Regulatory Liabilities$1,431.2 $1,510.7