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Employee Benefit Plans - Net Periodic Expense (Income) and Additional Information (Details) - Pension plans - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
United States |  |  |
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets |  |  |
Projected benefit obligation | $ 221.7 | $ 241.1 |
Accumulated benefit obligation | 221.7 | 241.1 |
Fair value of plan assets | 146.4 | 164.8 |
Accumulated benefit obligation | 226.1 | 245.7 |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |
Service cost | 0.0 | 0.0 | $ 0.0
Interest cost | 12.1 | 13.0 | 10.5
Expected return on plan assets | (8.8) | (8.8) | (8.2)
Amortization of unrecognized prior service credits | 0.0 | 0.0 | (0.1)
Recognized net actuarial (gains) losses | 1.4 | 5.6 | (1.6)
Total net periodic pension benefit expense | $ 4.7 | $ 9.8 | $ 0.6
Weighted-average actuarial assumptions used in determining net periodic pension expense: |  |  |
Discount rate | 5.18% | 5.54% | 3.99%
Expected long-term rate of return on assets | 5.47% | 5.23% | 3.23%
Weighted-average actuarial assumptions used in determining year-end benefit obligations: |  |  |
Discount rate used in determining year-end postretirement benefit obligation | 5.57% | 5.18% | 5.54%
Foreign Plan |  |  |
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets |  |  |
Projected benefit obligation | $ 0.1 | $ 0.1 |
Accumulated benefit obligation | 0.1 | 0.1 |
Fair value of plan assets | 0.0 | 0.0 |
Accumulated benefit obligation | 99.5 | 120.2 |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |
Service cost | 0.0 | 0.0 | $ 0.0
Interest cost | 5.6 | 5.6 | 3.7
Expected return on plan assets | (5.1) | (6.4) | (5.6)
Amortization of unrecognized prior service credits | 0.0 | 0.0 | 0.1
Recognized net actuarial (gains) losses | 1.1 | 5.5 | 6.4
Total net periodic pension benefit expense | $ 1.6 | $ 4.7 | $ 4.6
Weighted-average actuarial assumptions used in determining net periodic pension expense: |  |  |
Discount rate | 4.83% | 5.15% | 2.19%
Expected long-term rate of return on assets | 5.20% | 6.08% | 3.44%
Weighted-average actuarial assumptions used in determining year-end benefit obligations: |  |  |
Discount rate used in determining year-end postretirement benefit obligation | 5.46% | 4.83% | 5.15%

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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