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Pension and Other Post-retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2025

Retirement Benefits [Abstract]

Schedule of Changes in Benefit Obligations and Plan Assets

The following table presents the changes in benefit obligations and plan assets for the years ended December 31, 2025 and 2024 and the funded status and weighted-average assumptions used to determine the benefit obligation at the measurement date (dollars in millions):

						Years Ended December 31,
						2025																		2024
						Pension Benefits						Other Benefits						Total						Pension Benefits						Other Benefits						Total
Projected benefit obligation:
BALANCE at the beginning of the period						$	571.3					$	10.2					$	581.5					$	606.5					$	11.0					$	617.5
Interest cost						30.5						0.5						31.0						29.3						0.5						29.8
Actuarial loss (gain)						5.3						—						5.3						(22.1)						(0.7)						(22.8)
Benefits paid						(42.1)						(0.6)						(42.7)						(42.4)						(0.6)						(43.0)
BALANCE at the end of the period						$	565.0					$	10.1					$	575.1					$	571.3					$	10.2					$	581.5
Plan assets
Fair value, at the beginning of the period						$	469.9					$	—					$	469.9					$	471.2					$	—					$	471.2
Actual return						60.1						—						60.1						20.2						—						20.2
Employer contributions						16.0						—						16.0						20.9						—						20.9
Benefits paid						(42.1)						—						(42.1)						(42.4)						—						(42.4)
Fair value, at the end of the period						$	503.9					$	—					$	503.9					$	469.9					$	—					$	469.9
Net benefit liabilities						$	61.1					$	10.1					$	71.2					$	101.4					$	10.2					$	111.6
Amounts recognized in Consolidated Balance Sheet:
Accrued liabilities						$	(2.0)					$	(0.9)					$	(2.9)					$	(4.1)					$	(1.0)					$	(5.1)
Other liabilities (long-term)						(59.1)						(9.2)						(68.3)						(97.3)						(9.2)						(106.5)
Net benefit liabilities						$	(61.1)					$	(10.1)					$	(71.2)					$	(101.4)					$	(10.2)					$	(111.6)
Accumulated contributions less than net periodic benefit cost						$	(114.1)					$	(18.0)					$	(132.1)					$	(129.5)					$	(18.5)					$	(148.0)
Amounts not yet reflected in net periodic benefit cost:
Actuarial gain						53.2						7.9						61.1						28.3						8.3						36.6
Prior service cost						(0.2)						—						(0.2)						(0.2)						—						(0.2)
Total accumulated other comprehensive income						$	53.0					$	7.9					$	60.9					$	28.1					$	8.3					$	36.4
Net benefit liabilities						$	(61.1)					$	(10.1)					$	(71.2)					$	(101.4)					$	(10.2)					$	(111.6)
Weighted-average assumptions:
Discount rate						5.34		%				5.28		%										5.54		%				5.52		%
Cash balance interest credit rate						3.72		%				N/A												3.26		%				N/A

Schedule of Net Periodic Pension Costs and Weighted Average Assumptions

The components of net periodic pension, retiree medical (income) loss and the weighted-average assumptions used to determine such amounts were as follows (dollars in millions):

						Years Ended December 31,
						2025						2024						2023
Interest cost						$	31.0					$	29.8					$	31.2
Expected return on plan assets						(29.4)						(31.6)						(31.4)
Amortization of net gain						(0.7)						(0.6)						(0.7)
Net periodic pension and retiree medical (income) loss (1)						$	0.9					$	(2.4)					$	(0.9)
Discount rate						5.54		%				4.97		%				5.21		%
Expected return on assets						6.44		%				6.88		%				7.10		%
Cash balance interest credit rate						3.26		%				3.26		%				3.23		%

(1)All components of Net periodic pension and retiree medical (income) loss are included in Other, net, in our Consolidated Statements of Operations.

Schedule of Allocation of Plan Assets

Target allocations among asset categories as of December 31, 2025, and the fair value of each category of plan assets as of December 31, 2025 and 2024, are presented below. The plans will reallocate assets in accordance with the allocation targets, after giving consideration to the expected level of cash required to pay current benefits and plan expenses (dollars in millions):

			December 31,
			2025															2024
			Target range (1)						Amount									Amount
Equities:
Global equity fund (2)			41% to 47%						$	217.3								$	—
U.S. equity:
U.S. large cap									—									93.3
U.S. small/mid cap									—									24.6
Global Low Volatility Equity									—									34.1
Non-U.S. equity:
International all cap									—									42.7
International small cap									—									18.9
Emerging markets									—									34.1
Real estate equities			4% to 8%						36.5									36.5
Fixed income:			45% to 55%
Long-term corporate bonds									160.2									102.8
Long-term government bonds									32.0									—
U.S. Treasury STRIPS									52.9									76.7
Cash and equivalents			$0 - $5.0						5.0									6.2
Total									$	503.9								$	469.9

(1)Our investment policy only sets allocation target ranges for general asset classes and not specific investment types.

(2)During 2025, the assets in the various equity asset categories were consolidated into a single Global equity fund.

Schedule of Expected Benefit Payments

Estimated future annual benefit payments from plan assets are presented below. Such amounts are based on existing benefit formulas and include the effect of future service (in millions):

						Pension Benefits						Other Post-Retirement Benefits
Years ending December 31,
2026						$	41.0					$	0.9
2027						40.7						0.9
2028						40.4						0.9
2029						40.2						0.8
2030						39.7						0.8
2031 through 2035						189.9						3.6

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