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Employee Benefit Plans: Components of Net Periodic Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Defined Benefit Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | $ 0.4 | $ 0.6 | $ 1.3 | $ 1.7
Interest cost | 4.0 | 4.1 | 12.0 | 12.3
Expected return on plan assets | (4.2) | (4.5) | (12.7) | (13.4)
Net amortization of prior service costs | 0.0 | 0.0 | (0.1) | (0.1)
Recognized net actuarial loss | 0.5 | 0.5 | 1.6 | 1.5
Net periodic expense | 0.7 | 0.7 | 2.1 | 2.0
Supplemental Non-Qualified Defined Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 1.2 | 1.3 | 2.8 | 2.9
Interest cost | 0.3 | 0.4 | 1.1 | 1.1
Expected return on plan assets | 0.0 | 0.0 | 0.0 | 0.0
Net amortization of prior service costs | 0.0 | 0.0 | 0.0 | 0.0
Recognized net actuarial loss | 0.0 | 0.0 | 0.0 | 0.0
Net periodic expense | 1.5 | 1.7 | 3.9 | 4.0
Non-pension Defined Benefit Postretirement Healthcare Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 0.4 | 0.4 | 1.1 | 1.2
Interest cost | 0.6 | 0.6 | 1.8 | 1.8
Expected return on plan assets | (0.1) | (0.1) | (0.2) | (0.2)
Net amortization of prior service costs | 0.1 | 0.1 | 0.2 | 0.1
Recognized net actuarial loss | 0.0 | 0.0 | 0.0 | 0.0
Net periodic expense | $ 1.0 | $ 1.0 | $ 2.9 | $ 2.9

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