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Postretirement Benefit Plans - Rollforward of the Projected Benefit Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in benefit obligation |  |  |  |
Benefit obligation as of January 1 | $ 149.8 | $ 214.3 |  |
Service cost | 1.1 | 1.8 |  |
Interest cost | 6.1 | 3.5 |  |
Amendments | 0.0 | (8.1) |  |
Actuarial loss (gain)(a) | 0.8 | (44.6) | [1] |
Benefits paid | (9.1) | (11.1) |  |
Settlement | (0.4) | 0.0 |  |
Foreign currency translation | 2.3 | (6.0) |  |
Benefit obligation as of December 31 | 150.6 | 149.8 |  | $ 214.3
Pension Plan [Member] |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation as of January 1 | 79.1 |  |  |
Service cost | 0.8 | 1.2 |  | 1.4
Interest cost | 3.0 | 1.3 |  | 1.0
Benefit obligation as of December 31 | 84.4 | 79.1 |  |
Other Postretirement Benefits Plan [Member] |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation as of January 1 | 70.7 | 106.4 |  |
Service cost | 0.3 | 0.6 |  | 0.7
Interest cost | 3.1 | 2.2 |  | 1.8
Amendments | 0.0 | (8.1) |  |
Actuarial loss (gain)(a) | (2.9) | (23.3) | [1] |
Benefits paid | (5.0) | (7.1) |  |
Settlement | 0.0 | 0.0 |  |
Foreign currency translation | 0.0 | 0.0 |  |
Benefit obligation as of December 31 | 66.2 | 70.7 |  | 106.4
United States | Pension Plan [Member] |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation as of January 1 | 11.2 | 14.8 |  |
Service cost | 0.0 | 0.0 |  | 0.0
Interest cost | 0.6 | 0.3 |  | 0.3
Amendments | 0.0 | 0.0 |  |
Actuarial loss (gain)(a) | 0.3 | (3.0) | [1] |
Benefits paid | (0.9) | (0.9) |  |
Settlement | 0.0 | 0.0 |  |
Foreign currency translation | 0.0 | 0.0 |  |
Benefit obligation as of December 31 | 11.2 | 11.2 |  | 14.8
International Plan [Member] | Pension Plan [Member] |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation as of January 1 | 67.9 | 93.1 |  |
Service cost | 0.8 | 1.2 |  | 1.4
Interest cost | 2.4 | 1.0 |  | 0.7
Amendments | 0.0 | 0.0 |  |
Actuarial loss (gain)(a) | 3.4 | (18.3) | [1] |
Benefits paid | (3.2) | (3.1) |  |
Settlement | (0.4) | 0.0 |  |
Foreign currency translation | 2.3 | (6.0) |  |
Benefit obligation as of December 31 | $ 73.2 | $ 67.9 |  | $ 93.1
[1] | The actuarial gain in 2022 is primarily due to an increase in discount rates during the year.

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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