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Pension and Postretirement Health and Life Benefits (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)
Gain (loss) related to litigation settlement			$ 43.5
Defined Contribution Plan, Cost	$ 2.3	$ 2.1
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement	$ 24.6	(7.8)	50.5
Pension Plan, Defined Benefit [Member]
Approximate Number of Plan Participants	2,900
Gain (loss) related to litigation settlement			33.8
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement	$ (25.2)	(138.0)
Pension Plan, Defined Benefit [Member] | Qualified Plan [Member]
Expected defined benefit plan contributions for next fiscal year for qualified plans	0.4
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]
Approximate Number of Plan Participants	2,900
Gain (loss) related to litigation settlement			$ 9.7
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment				$ (10.0)	$ (3.6)	$ (6.8)
Expected defined benefit plan contributions for next fiscal year for qualified plans	$ 10.1
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement	$ 1.4	$ (27.0)

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Amount of increase (decrease) in accumulated benefit obligation from change in existing term of defined benefit plan or initiation of new defined benefit plan.

+ References

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-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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-Publisher FASB
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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
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-Section 50
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-Topic 715
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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

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-Topic 450
-SubTopic 20
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