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Employee Benefit Plans: Plan Contributions (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	$ 1.8
Payment for Pension Benefits	2.3
Estimated Future Employer Contributions in Current Fiscal Year	0.0
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	4.4
Payment for Pension Benefits	2.3
Estimated Future Employer Contributions in Current Fiscal Year	2.3
Supplemental Non-Qualified Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	2.8
Payment for Pension Benefits	1.2
Estimated Future Employer Contributions in Current Fiscal Year	$ 1.2

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year.

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