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OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Other Income (Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Other Income (Expense)
Total Other Income	$ 5.5	$ 68.7	$ 20.0	$ 75.3
Pension and Other Postretirement Benefit Plan Non-Service Credits
Other Income (Expense)
Total Other Income	3.0	1.8	11.0	5.5
Interest and Investment Income
Other Income (Expense)
Total Other Income	1.2	6.6	3.9	8.7
AFUDC - Equity
Other Income (Expense)
Total Other Income	1.5	1.1	4.0	2.5
Gain on Arbitration Award
Other Income (Expense)
Total Other Income	0.0	58.4	0.0	58.4
Other Income (Expense)
Other Income (Expense)
Total Other Income	$ (0.2)	0.8	$ 1.1	0.2
Interest Income Related To Interest Awarded As Part Of An Arbitration Ruling
Other Income (Expense)
Total Other Income		$ 5.1		$ 5.1