Retirement and Postretirement Plans - Summary of Changes in the Fair Value of Pension Plan Level Three Assets (Details) - Pension $ in Millions |
12 Months Ended |
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Dec. 31, 2025
USD ($)
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| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |
| Fair value of plan assets at the beginning of year | $ 396.6 |
| Fair value of plan assets at end of year | 443.1 |
| Level 3 | |
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |
| Fair value of plan assets at the beginning of year | 51.9 |
| Transfers in and/or out of Level 3 | 0.0 |
| Realized gain (loss) | 0.9 |
| Net unrealized gain (loss) | 2.8 |
| Purchases | 5.8 |
| Sales | (4.6) |
| Fair value of plan assets at end of year | $ 56.8 |
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- Definition Defined benefit plan realized gain (loss). No definition available.
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- Definition Defined benefit plan unrealized gain (loss). No definition available.
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, measured using unobservable input, of decrease in plan asset of defined benefit plan from sale. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, measured using unobservable input, of increase in plan asset of defined benefit plan from purchase. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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