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Operations and Significant Accounting Policies - Other Income (Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Income (Expense) - Other [Line Items]
Total Other Income (Expense) - Other	$ 23.0	$ 85.0	$ 22.4
Pension and Other Postretirement Benefit Plan Non-Service Credit
Other Income (Expense) - Other [Line Items]
Total Other Income (Expense) - Other	13.6	8.9	9.8
Interest and Investment Income
Other Income (Expense) - Other [Line Items]
Total Other Income (Expense) - Other	4.0	10.3	0.0
AFUDC - Equity
Other Income (Expense) - Other [Line Items]
Total Other Income (Expense) - Other	5.0	3.6	2.7
Gain on Land Sales
Other Income (Expense) - Other [Line Items]
Total Other Income (Expense) - Other	0.1	0.2	0.0
PSA Liability
Other Income (Expense) - Other [Line Items]
Total Other Income (Expense) - Other	0.0	0.0	10.2
Gain on Arbitration Award
Other Income (Expense) - Other [Line Items]
Total Other Income (Expense) - Other	0.0	58.4	0.0
Other Income (Expense)
Other Income (Expense) - Other [Line Items]
Total Other Income (Expense) - Other	$ 0.3	3.6	$ (0.3)
Interest Income Related To Interest Awarded As Part Of An Arbitration Ruling
Other Income (Expense) - Other [Line Items]
Total Other Income (Expense) - Other		$ 5.1