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Other Post-Employment Benefit Plans - Reconciliation of Benefit Obligations, Plan Assets and Funded Status for Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in plan assets: |  |  |
Fair value of plan assets at beginning of period | $ 570.4 |  |
Fair value of plan assets at end of period | 596.1 | $ 570.4 |
Other Post-Employment Benefits and Other Employee Benefit Plans |  |  |
Change in benefit obligations: |  |  |
Benefit obligation at beginning of period | 33.3 | 40.4 |
Interest cost | 1.6 | 0.7 | $ 0.6
Actuarial loss (gain) | (1.6) | (5.0) |
Benefits paid, net | (2.9) | (2.8) |
Benefit obligation at end of period | 30.4 | 33.3 | 40.4
Change in plan assets: |  |  |
Fair value of plan assets at beginning of period | 0.0 | 0.0 |
Employer contribution | 2.9 | 2.8 |
Benefits paid, net | (2.9) | (2.8) |
Fair value of plan assets at end of period | 0.0 | 0.0 | $ 0.0
Net amount recognized: |  |  |
Underfunded status at end of year | (30.4) | (33.3) |
Accumulated benefit obligation at end of year | 30.4 | 33.3 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Current liability | (4.6) | (5.0) |
Non-current liability | (25.8) | (28.3) |
Net amount recognized | (30.4) | (33.3) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net actuarial gain | (5.3) | (3.8) |
Net prior service credit | (1.3) | (1.6) |
Total | $ (6.6) | $ (5.4) |

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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, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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