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Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Pension Benefits |  |
Assets & Liabilities: |  |
Non-current assets | $ 5.3 | $ 5.2
Current liabilities | 0.0 | 0.0
Non-current liabilities | 0.0 | (0.2)
Net assets (liabilities) | 5.3 | 5.0
Accumulated Other Comprehensive Loss: |  |
Net actuarial (loss) gain | (11.6) | (11.8)
Accumulated other comprehensive (loss) income | (11.6) | (11.8)
Other Postretirement Benefits |  |
Assets & Liabilities: |  |
Non-current assets | 0.0 | 0.0
Current liabilities | (0.2) | (0.2)
Non-current liabilities | (1.4) | (1.2)
Net assets (liabilities) | (1.6) | (1.4)
Accumulated Other Comprehensive Loss: |  |
Net actuarial (loss) gain | 0.2 | 0.2
Accumulated other comprehensive (loss) income | $ 0.2 | $ 0.2

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