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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2023
Retirement Benefits [Abstract] |
Employee Benefit Plans | Note 12 – Employee Benefit Plans Net periodic benefit costs related to the Company’s unfunded supplemental benefit pension plans are summarized as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(in millions) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Expense: |  |  |  |  |  |  |  |  |  |  |  |
Interest costs |  | $ | 2.6 |  |  | $ | 1.5 |  |  | $ | 5.1 |  |  | $ | 3.0 |
Amortization of net actuarial loss |  |  | 0.6 |  |  |  | 1.4 |  |  |  | 1.1 |  |  |  | 2.9 |
Amortization of prior service cost |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 0.2 |
|  | $ | 3.2 |  |  | $ | 3.0 |  |  | $ | 6.2 |  |  | $ | 6.1 |
The Company contributed $7.7 million to its unfunded supplemental benefit pension plans during the six months ended June 30, 2023 and expects to contribute an additional $8.0 million during the remainder of 2023.

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- Definition The entire disclosure of an entity's employee compensation and benefit plans, excluding share-based compensation and including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 710 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//710/tableOfContent Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 712 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//712/tableOfContent Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//715/tableOfContent + Details
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