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Pension and Postretirement Health and Life Benefits (Tables)

12 Months Ended

Dec. 31, 2023

Defined Benefit Plan Disclosure [Line Items]

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

Changes in the projected benefit obligations and plan assets and the funded status of the plans follow:

			Defined Benefit Pension Plans												Postretirement Health and Life Benefit Plans
($ millions)			Year Ended December 31,												Year Ended December 31,
			2023						2022						2023						2022
Changes in Benefit Obligations:
Obligations at beginning of period			$	527.3					$	696.2					$	95.3					$	131.1
Actuarial (gains) losses, net			(25.2)						(138.0)						1.4						(27.0)
Service costs			2.9						2.7						—						—
Interest costs			27.8						19.1						5.0						3.5
Benefits paid from plan assets			(50.2)						(50.0)						(10.4)						(12.3)
Benefits paid from Company assets			(0.4)						(0.4)						—						—
Plan amendments			0.4						—						—						—
Settlements			(171.4)						—						—						—
Administrative expenses paid			(3.0)						(2.3)						—						—
Obligations at end of period			308.2						527.3						91.3						95.3
Changes in Plan Assets:
Fair value of plan assets at beginning of period			483.3						672.7						3.5						9.2
Actual return on plan assets			31.8						(137.1)						0.1						(0.1)
Company contributions			0.4						0.4						6.8						6.7
Benefits paid			(50.6)						(50.4)						(10.4)						(12.3)
Settlements			(171.4)						—						—						—
Administrative expenses paid			(3.0)						(2.3)						—						—
Fair value of plan assets at end of period			290.5						483.3						—						3.5
Unfunded status at end of period			$	(17.7)					$	(44.0)					$	(91.3)					$	(91.8)
Amounts recognized in assets and liabilities:
Current liabilities			$	(0.4)					$	(0.4)					$	(10.1)					$	(7.3)
Non current liabilities			(17.3)						(43.6)						(81.2)						(84.5)
			$	(17.7)					$	(44.0)					$	(91.3)					$	(91.8)
Amounts in accumulated other comprehensive income (loss), pre-tax:
Prior service credit			$	(0.1)					$	(0.7)					$	(1.8)					$	(1.9)

Schedule of Net Benefit Costs [Table Text Block]

Components of Net Periodic Benefit Costs and Other Amounts Recognized in Other Comprehensive Income

The Company reports service costs for its defined benefit pension plans and its postretirement health and life benefit plans in Cost of Sales and Selling, General and Administrative Expenses. The remaining components of net periodic benefit (credits) costs are reported as Nonoperating Components of Net Periodic Benefit Income.

			Defined Benefit Pension Plans																		Postretirement Health and Life Benefit Plans
(in millions)			Year Ended December 31,																		Year Ended December 31,
			2023						2022						2021						2023						2022						2021
Net Periodic Benefit (Credits) Costs
Service costs			$	2.9					$	2.7					$	2.7					$	—					$	—					$	—
Interest costs			27.8						19.1						18.1						5.0						3.5						3.4
Expected return on plan assets			(31.0)						(35.6)						(38.3)						(0.1)						(0.1)						—
Amortization of prior service credits, net			(0.2)						(0.2)						(0.2)						(0.1)						(0.1)						(0.1)
Actuarial (gains) losses, net			(26.0)						34.7						(48.2)						1.4						(26.9)						(2.3)
Net periodic benefit (credits) costs			$	(26.5)					$	20.7					$	(65.9)					$	6.2					$	(23.6)					$	1.0

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)
Amortization of prior service costs, net			$	—					$	—					$	—					$	(1.8)					$	(1.9)					$	(2.0)
Prior service credit			(0.1)						(0.7)						(0.9)						—						—						—
Total recognized in other comprehensive loss, pre-tax			$	(0.1)					$	(0.7)					$	(0.9)					$	(1.8)					$	(1.9)					$	(2.0)
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax			$	(26.6)					$	20.0					$	(66.8)					$	4.4					$	(25.5)					$	(1.0)

Schedule of Assumptions Used [Table Text Block]

Assumptions Used to Determine Net Periodic Benefit Costs

			Defined Benefit Pension Plans																		Postretirement Health and Life Benefit Plans
			Year Ended December 31,																		Year Ended December 31,
			2023						2022						2021						2023						2022						2021
Discount rate			5.2%						5.5%						2.8%						5.2%						5.5%						2.8%
Expected return on plan assets			6.8%						5.5%						6.3%						4.0%						0.8%						—

Schedule of Health Care Cost Trend Rates [Table Text Block]

Healthcare cost trend rates used to measure postretirement health benefit obligations follow:

			December 31,
			2023						2022
Healthcare cost trend rate for the following year			7.0%						7.0%
Long-term rate that the healthcare cost trend rate gradually declines to			5%						5%
Year that the healthcare cost trend rate is expected to reach the long-term rate			2032						2031

Schedule of Allocation of Plan Assets [Table Text Block]

Plan assets are measured at fair value. Following are the plan investments as of December 31, 2023 and 2022, categorized by the fair value hierarchy levels described in Note 10, Fair Value:

			Defined Benefit Pension and Postretirement Health and Life Benefit Plans
(in millions)			Level 1												Level 2												Level 3												Total
			2023						2022						2023						2022						2023						2022						2023						2022
U.S. government securities			$	—					$	—					$	—					$	—					$	—					$	—					$	—					$	—
Corporate debt			—						—						9.6						60.3						—						—						9.6						60.3
Municipal bonds and non-U.S. government securities			—						—						—						—						—						—						—						—
Mutual funds (b)			245.7						320.4						—						—						—						—						245.7						320.4
Mortgage and asset backed securities			—						—						—						—						—						—						—						—
Fair value of investments by hierarchy level			$	245.7					$	320.4					$	9.6					$	60.3					$	—					$	—					255.3						380.7
Investments measured at NAV (a)																																							35.2						105.8
Accrued interest receivable																																							0.5						0.6
Unsettled transactions																																							—						(0.3)
Plan assets																																							$	291.0					$	486.8

Schedule of Expected Benefit Payments [Table Text Block]

Estimated future benefit plan payments follow (in millions):

			Defined Benefit Pension Plans						Postretirement Health and Life Benefit Plans
2024			$	30.0					$	10.1
2025			28.5						9.5
2026			28.6						9.0
2027			26.9						8.4
2028			26.1						7.8
2029 to 2033			120.1						31.6

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Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate.

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Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits.

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Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

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