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Pension and Other Postretirement Benefit Plans - Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Pension | U.S. |  |
Actuarial gains (losses) recognized: |  |
Reclassification adjustments | $ 2.3 | $ 1.8
Actuarial loss arising during the period | (46.1) | (21.7)
Effect of curtailment | 0.0 | 0.0
Effect of settlements | 0.3 | 0.1
Prior service credit recognized: |  |
Reclassification adjustments | 0.0 | 0.0
Prior service cost arising during the period | 0.0 | 0.0
Translation adjustment | 0.0 | 0.0
Pretax amounts recognized in other comprehensive (income) loss | (43.5) | (19.8)
Pension | Foreign |  |
Actuarial gains (losses) recognized: |  |
Reclassification adjustments | 5.2 | 7.8
Actuarial loss arising during the period | (39.7) | (33.8)
Effect of curtailment | 0.0 | 0.1
Effect of settlements | 13.0 | 0.0
Prior service credit recognized: |  |
Reclassification adjustments | 0.0 | 0.0
Prior service cost arising during the period | 0.0 | 0.0
Translation adjustment | (3.6) | (3.8)
Pretax amounts recognized in other comprehensive (income) loss | (25.1) | (29.7)
Other Postretirement | U.S. |  |
Actuarial gains (losses) recognized: |  |
Reclassification adjustments | (1.6) | (2.3)
Actuarial loss arising during the period | (6.9) | (4.5)
Effect of curtailment | 0.0 | 0.0
Effect of settlements | 0.0 | 0.0
Prior service credit recognized: |  |
Reclassification adjustments | (0.2) | (0.2)
Prior service cost arising during the period | (0.4) | 0.0
Translation adjustment | 0.0 | 0.0
Pretax amounts recognized in other comprehensive (income) loss | (9.1) | (7.0)
Other Postretirement | Foreign |  |
Actuarial gains (losses) recognized: |  |
Reclassification adjustments | 0.0 | 0.0
Actuarial loss arising during the period | (2.1) | 0.0
Effect of curtailment | 0.0 | 0.0
Effect of settlements | 0.0 | 0.0
Prior service credit recognized: |  |
Reclassification adjustments | 0.0 | (0.2)
Prior service cost arising during the period | 0.0 | 0.0
Translation adjustment | 0.0 | 0.0
Pretax amounts recognized in other comprehensive (income) loss | $ (2.1) | $ (0.2)

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- Definition Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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