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Pension and Postretirement Health and Life Benefits (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	May 28, 2024 USD ($)	Oct. 12, 2023 USD ($)
Defined Contribution Plan, Cost				$ 2.6	$ 2.3	$ 2.1
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement				$ 17.3	24.6	(7.8)
Portion of Defined Benefit Plan, Benefit Obligation related to Remeasurement						30.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment		$ 16.8	$ 0.9
Defined Benefit Plan, Pension Plan Obligation Transferred							$ 234.0	$ 186.5
Defined Benefit Plan, Pension Plan Assets Transferred		$ 15.4					$ 224.0	$ 171.4
Income (Loss) Related to Pension Settlement	$ 28.6
Pension Plan, Defined Benefit [Member]
Approximate Number of Plan Participants				300
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement				$ (21.9)	(25.2)
Defined Benefit Plan, Benefit Obligation	308.2			30.6	308.2	527.3
Pension Plan, Defined Benefit [Member] | Qualified Plan [Member]
Expected defined benefit plan contributions for next fiscal year for qualified plans				0.0
Pension Plan, Defined Benefit [Member] | Nonqualified Plan [Member]
Expected defined benefit plan contributions for next fiscal year for qualified plans				0.4
Other Postretirement Benefits Plan [Member]
Expected defined benefit plan contributions for next fiscal year for qualified plans				9.6
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement				0.0	1.4
Defined Benefit Plan, Benefit Obligation	$ 91.3			$ 84.1	$ 91.3	$ 95.3

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(4)
-Publisher FASB
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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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-Section 50
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-Publisher FASB
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Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment.

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