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Operations and Significant Accounting Policies - Other Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Other Income (Expense) - Other [Line Items]        
Total Other Income $ 2.5 $ 12.1 $ 6.6 $ 14.1
Pension and Other Postretirement Benefit Plans Non-Service Credit [Member]        
Other Income (Expense) - Other [Line Items]        
Total Other Income [1] 1.7 2.7 3.7 5.3
Interest and Investment Income (Loss) [Member]        
Other Income (Expense) - Other [Line Items]        
Total Other Income 1.0 (1.0) 2.1 (0.9)
AFUDC - Equity [Member]        
Other Income (Expense) - Other [Line Items]        
Total Other Income 0.9 0.8 1.4 1.7
PSA Liability [Member]        
Other Income (Expense) - Other [Line Items]        
Total Other Income 0.0 10.2 [2] 0.0 10.2 [2]
Other [Member]        
Other Income (Expense) - Other [Line Items]        
Total Other Income $ (1.1) $ (0.6) $ (0.6) $ (2.2)
[1] These are components of net periodic pension and other postretirement benefit cost other than service cost. (See Note 9. Pension and Other Postretirement Benefit Plans.)
[2] The gain on removal of the PSA liability for the Northern Wind project upon decommissioning of the legacy wind energy facility assets, which was more than offset by a reserve for an anticipated loss on the sale of the Northern Wind project that was recorded in Cost of Sales - Non-Utility on the Consolidated Statement of Income.