Pension and Postretirement Benefits (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Pension Benefits | ||||
| Components of net periodic benefit cost | ||||
| Service costs | $ 1.3 | $ 0.9 | $ 2.6 | $ 1.9 |
| Interest costs | 0.7 | 0.8 | 1.6 | 1.7 |
| Expected return on plan assets | (3.0) | (2.8) | (6.1) | (5.6) |
| Recognized net actuarial loss | 0.0 | 0.2 | 0.1 | 0.3 |
| Net periodic benefit (income) expense | (1.0) | (0.9) | (1.8) | (1.7) |
| Postretirement Benefits | ||||
| Components of net periodic benefit cost | ||||
| Service costs | 0.0 | 0.0 | 0.0 | 0.0 |
| Interest costs | 0.1 | 0.1 | 0.1 | 0.1 |
| Expected return on plan assets | (0.1) | (0.1) | (0.1) | (0.1) |
| Recognized net actuarial loss | 0.1 | 0.0 | 0.1 | 0.0 |
| Net periodic benefit (income) expense | $ 0.1 | $ 0.0 | $ 0.1 | $ 0.0 |
| X | ||||||||||
- Definition Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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