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Retirement Plans and Postretirement Benefits - Schedule of Plan Assets Investments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 662.8 | $ 185.3 | $ 0.0
Diversified Growth Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 84.5 | 32.4 |
Liability Driven Instrument |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 226.4 | 113.7 |
Property |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 28.1 | 0.0 |
Credit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 92.3 | 0.0 |
Private Markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 37.8 | 0.0 |
Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 26.1 | 0.0 |
Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 17.4 | 0.0 |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 150.2 | 39.2 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 109.6 | 39.2 |
Level 1 | Diversified Growth Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 1 | Liability Driven Instrument |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 1 | Property |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 1 | Credit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 1 | Private Markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 1 | Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 1 | Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 1 | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 109.6 | 39.2 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 469.9 | 146.1 |
Level 2 | Diversified Growth Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 84.5 | 32.4 |
Level 2 | Liability Driven Instrument |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 226.4 | 113.7 |
Level 2 | Property |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 2 | Credit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 92.3 | 0.0 |
Level 2 | Private Markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 2 | Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 26.1 | 0.0 |
Level 2 | Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 2 | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 40.6 | 0.0 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 83.3 | 0.0 |
Level 3 | Diversified Growth Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 3 | Liability Driven Instrument |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 3 | Property |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 28.1 | 0.0 |
Level 3 | Credit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 3 | Private Markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 37.8 | 0.0 |
Level 3 | Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0.0 | 0.0 |
Level 3 | Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 17.4 | 0.0 |
Level 3 | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 0.0 | $ 0.0 |

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