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Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Assets Carried at Fair Value by Level) (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | $ 26.7 | $ 26.3 | $ 33.5
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 3.2 | 2.5 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 22.4 | 22.7 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 1.1 | 1.1 |
Fixed income bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 22.5 | 22.2 |
Fixed income bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0.2 | 0.0 |
Fixed income bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 22.3 | 22.2 |
Fixed income bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0.0 | 0.0 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 3.0 | 2.5 |
Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 3.0 | 2.5 |
Mutual funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0.0 | 0.0 |
Mutual funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0.0 | 0.0 |
Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0.1 | 0.5 |
Pooled separate accounts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0.0 | 0.0 |
Pooled separate accounts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0.1 | 0.5 |
Pooled separate accounts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0.0 | 0.0 |
Guaranteed deposit account |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 1.1 | 1.1 |
Guaranteed deposit account | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0.0 | 0.0 |
Guaranteed deposit account | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0.0 | 0.0 |
Guaranteed deposit account | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | $ 1.1 | $ 1.1 |

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