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Pension and Other Postretirement Benefits - Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total recognized in other comprehensive (income) loss, after taxes | $ (22.4) | $ 6.6 | $ 7.9
Pensions |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Current year net actuarial loss (gain) | (12.2) | 22.1 |
Amortization of net actuarial (loss) gain | (15.5) | (12.4) |
Amortization of prior service (cost) credit | (0.1) | (0.2) |
Settlement loss | (0.1) | (0.5) |
Total recognized in other comprehensive (income) loss, before taxes | (27.9) | 9.0 |
Total recognized in other comprehensive (income) loss, after taxes | (22.8) | 7.2 |
Other Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Current year net actuarial loss (gain) | (1.4) | (1.7) |
Amortization of net actuarial (loss) gain | 1.0 | 0.8 |
Amortization of prior service (cost) credit | 0.0 | 0.0 |
Settlement loss | 0.0 | 0.0 |
Total recognized in other comprehensive (income) loss, before taxes | (0.4) | (0.9) |
Total recognized in other comprehensive (income) loss, after taxes | $ (0.3) | $ (1.1) |

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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 15 -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-15 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 17A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-17A + Details
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