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Postretirement Benefits Pretax Activity in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Prior Service Costs (Credits) [Abstract] |  |  |
Amount Recognized as Component of Net Benefit Costs | $ (0.7) | $ (0.2) | $ (0.7)
Net Actuarial Losses [Abstract] |  |  |
Amount Recognized as Component of Net Benefit Costs | $ 0.9 | $ 1.1 | $ 1.1

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