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Pension, Health Care and Other Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Summary of the Components of the Net Pension Costs and Cumulative Other Comprehensive Loss Related to the Defined Benefit Pension Plans
The following table summarizes the components of the net pension costs and AOCI related to the defined benefit pension plans:
Domestic
Defined Benefit Pension Plan		Foreign
Defined Benefit Pension Plans
202320222021202320222021
Net pension cost:
Service cost$3.0 $4.6 $4.9 $4.4 $6.3 $7.4 
Interest cost4.6 3.2 2.7 11.8 7.3 5.7 
Expected return on plan assets(7.3)(7.6)(7.1)(12.3)(9.4)(9.6)
Amortization of prior service cost (credit)1.3 1.0 1.1 (0.2)(0.2)(0.1)
Amortization of actuarial (gains) losses(1.5)0.2 1.5 
Ongoing pension cost1.6 1.2 1.6 2.2 4.2 4.9 
  Settlement (credits) costs (1.1)(0.3)0.3 
Net pension cost1.6 1.2 1.6 1.1 3.9 5.2 
Other changes in plan assets and projected benefit
obligation recognized in AOCI (before taxes):
Net actuarial (gains) losses arising during the year(8.6)5.0 (10.5)5.8 (29.6)(44.9)
Prior service cost (credit) arising during the year3.0 1.6 1.4 1.1 (0.3)(1.0)
Amortization of actuarial gains (losses)1.5 (0.2)(1.5)
Amortization of prior service (cost) credit(1.3)(1.0)(1.1)0.2 0.20.1
Loss (gain) recognized for settlement1.1 0.3 (0.3)
Exchange rate (loss) recognized during the year(1.5)(0.4)(0.6)
Total recognized in AOCI(6.9)5.6 (10.2)8.2 (30.0)(48.2)
Total recognized in net pension cost and AOCI
$(5.3)$6.8 $(8.6)$9.3 $(26.1)$(43.0)
Summary of the Fair Value of the Defined Benefit Pension Plan Assets
The following tables summarize the fair value of the defined benefit pension plan assets at December 31, 2023, 2022 and 2021. The presentation is in accordance with the Fair Value Topic of the ASC.
Fair Value at
December 31,
2023
Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant 
Other
Observable 
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Investments at fair value:
Equity investments (1)
$133.0 $72.9 $60.1 
Fixed income investments (2)
188.9 36.8 152.1 
Other assets (3)
34.6 34.6 
Total investments in fair value hierarchy356.5 $109.7 $246.8 
Investments measured at NAV or its equivalent (4)
25.3 
Total investments$381.8 
Fair Value at
December 31,
2022
Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant 
Other
Observable 
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Investments at fair value:
Equity investments (1)
$80.1 $8.5 $71.6 
Fixed income investments (2)
117.6 117.6 
Other assets (3)
34.4 34.4 
Total investments in fair value hierarchy232.1 $8.5 $223.6 
Investments measured at NAV or its equivalent (4)
110.9 
Total investments$343.0 
Fair Value at
December 31,
2021
Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant 
Other
Observable 
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Investments at fair value:
Equity investments (1)
$133.1 $13.5 $119.6 
Fixed income investments (2)
172.1 172.1 
Other assets (3)
36.7 36.7 
Total investments in fair value hierarchy341.9 $13.5 $328.4 
Investments measured at NAV or its equivalent (4)
141.7 
Total investments$483.6 
(1)    This category includes actively managed equity assets that track primarily to the S&P 500 or an international equity index.
(2)    This category includes government and corporate bonds that track primarily to the Barclays Capital Aggregate Bond Index or an international bond index.
(3)    This category includes real estate and pooled investment funds.
(4)    This category includes pooled investment funds and private equity funds that are measured at NAV or its equivalent using the practical expedient. Therefore, these investments are not classified in the fair value hierarchy.
Summary of the Obligations, Plan Assets and Assumptions Used for Defined Benefit Pension Plans
The following table summarizes the obligations, plan assets and assumptions used for the defined benefit pension plans, which are all measured as of December 31:
Domestic
Defined Benefit Pension Plan		Foreign
Defined Benefit Pension Plans
202320222021202320222021
Accumulated benefit obligations
at end of year
$100.5 $90.3 $117.0 $236.4 $209.3 $334.8 
Projected benefit obligations:
Balances at beginning of year$91.7 $120.8 $118.6 $230.4 $362.7 $401.1 
Service cost3.0 4.6 4.9 4.4 6.3 7.4 
Interest cost4.6 3.2 2.7 11.8 7.3 5.7 
Actuarial losses (gains)2.8 (32.6)(2.8)8.8 (112.4)(26.0)
Contributions and other3.0 1.6 1.4 2.0 3.2 (4.6)
Settlements(3.7)(2.4)(1.7)
Effect of foreign exchange14.1 (28.8)(9.8)
Benefits paid(3.0)(5.9)(4.0)(10.0)(5.5)(9.4)
Balances at end of year102.1 91.7 120.8 257.8 230.4 362.7 
Plan assets:
Balances at beginning of year119.4 155.2 144.3 223.6 328.4 318.2 
Actual returns on plan assets18.7 (29.9)14.9 15.4 (73.4)27.9 
Contributions and other8.6 5.8 (1.1)
Settlements(3.7)(2.4)(1.7)
Effect of foreign exchange12.8 (29.3)(5.5)
Benefits paid(3.0)(5.9)(4.0)(10.0)(5.5)(9.4)
Balances at end of year135.1 119.4 155.2 246.7 223.6 328.4 
Excess (deficient) plan assets over
projected benefit obligations
$33.0 $27.7 $34.4 $(11.1)$(6.8)$(34.3)
Assets and liabilities recognized in the
Consolidated Balance Sheets:
Deferred pension assets$33.0 $27.7 $34.4 $57.9 $51.7 $44.7 
Other accruals(3.4)(3.0)(3.3)
Other long-term liabilities(65.6)(55.5)(75.7)
$33.0 $27.7 $34.4 $(11.1)$(6.8)$(34.3)
Amounts recognized in AOCI:
Net actuarial gains$16.6 $8.0 $13.0 $24.8 $31.7 $1.9 
Prior service (costs) credits(8.8)(7.1)(6.5)0.3 1.6 1.4 
$7.8 $0.9 $6.5 $25.1 $33.3 $3.3 
Weighted-average assumptions used to
determine projected benefit obligations:
Discount rate5.09 %5.27 %3.12 %4.81 %5.06 %2.26 %
Rate of compensation increase3.00 %3.00 %3.00 %3.33 %3.39 %3.25 %
Weighted-average assumptions used to
determine net pension cost:
Discount rate5.27 %3.12 %2.85 %5.06 %2.26 %1.63 %
Expected long-term rate of
return on assets
6.25 %5.00 %5.00 %5.48 %3.19 %3.17 %
Rate of compensation increase3.00 %3.00 %3.00 %3.39 %3.25 %2.91 %
Summary of the Obligation and the Assumptions Used for Postretirement Benefits Other than Pensions
The following table summarizes the obligation and the assumptions used for other postretirement benefits:
Other Postretirement Benefits
202320222021
Benefit obligation:
Balance at beginning of year - unfunded$153.8 $276.4 $291.6 
Service cost0.6 1.2 1.4 
Interest cost7.4 6.0 4.9 
Actuarial gain(8.0)(54.5)(4.1)
Plan amendments(62.8)(2.2)
Benefits paid(6.6)(12.5)(15.2)
Balance at end of year - unfunded$147.2 $153.8 $276.4 
Liabilities recognized in the Consolidated Balance Sheets:
Other accruals$(14.0)$(14.5)$(17.0)
Postretirement benefits other than pensions(133.2)(139.3)(259.4)
$(147.2)$(153.8) $(276.4)
Amounts recognized in AOCI:
Net actuarial gains (losses)$12.9 $4.7 $(54.0)
Prior service credits40.0 64.0 1.6 
$52.9 $68.7 $(52.4)
Weighted-average assumptions used to determine benefit obligation:
Discount rate4.97 %5.16 %2.83 %
Health care cost trend rate - pre-657.00 %6.25 %6.38 %
Health care cost trend rate - post-656.00 %5.50 %5.13 %
Prescription drug cost increases9.00 %8.25 %8.25 %
Employer Group Waiver Plan (EGWP) trend rateN/AN/A8.25 %
Weighted-average assumptions used to determine net periodic benefit cost:
Discount rate5.16 %2.83 %2.49 %
Health care cost trend rate - pre-656.25 %6.38 %6.06 %
Health care cost trend rate - post-655.50 %5.13 %5.13 %
Prescription drug cost increases8.25 %8.25 %8.25 %
Summary of the Components of Net Periodic Benefit Cost and Cumulative Other Comprehensive Loss Related to Postretirement Benefits Other than Pensions
The following table summarizes the components of the net periodic benefit cost and AOCI related to other postretirement benefits:
Other Postretirement Benefits
202320222021
Net periodic benefit cost:
Service cost$0.6 $1.2 $1.4 
Interest cost7.4 6.0 4.9 
Amortization of actuarial losses0.1 4.2 4.7 
Amortization of prior service (credit) cost(23.9)(0.4)0.3 
Net periodic benefit cost (15.8)11.0 11.3 
Other changes in projected benefit obligation recognized in
AOCI (before taxes):
Net actuarial gain arising during the year(8.0)(54.5)(4.1)
Prior service (credit) arising during the year(62.8)(2.2)
Amortization of actuarial losses(0.1)(4.2)(4.7)
Amortization of prior service credit (cost)23.9 0.4 (0.3)
Total recognized in AOCI15.8 (121.1)(11.3)
Total recognized in net periodic benefit cost and AOCI$— $(110.1)$— 
Expected Retiree Health Care Benefit Cash Payments
The Company expects to make retiree health care benefit cash payments as follows:
2024$14.0 
202514.9 
202614.8 
202714.4 
202813.7 
2029 through 203353.4 
Total expected benefit cash payments$125.2