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Pension and Other Retiree Benefits - Other Changes Recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial (gain) loss | $ (10.3) | $ 10.6 | $ 15.0
Amortization of actuarial (loss) gain | (3.6) | (3.2) | (2.2)
Amortization of prior service cost | (1.5) | (0.4) | (0.4)
Foreign exchange rate changes | 0.0 | 0.0 | 0.0
Total recognized in other comprehensive income (loss) | (15.4) | 7.0 | 12.4
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) | (16.7) | 6.7 | 12.0
Pension | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial (gain) loss | (30.5) | 36.5 | 43.3
Amortization of actuarial (loss) gain | (7.1) | (5.3) | (3.3)
Amortization of prior service cost | (0.3) | (0.3) | (0.3)
Foreign exchange rate changes | (4.1) | 8.5 | 3.4
Total recognized in other comprehensive income (loss) | (42.0) | 39.4 | 43.1
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) | (46.1) | 37.6 | 41.0
Post-retirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial (gain) loss | (0.5) | 0.0 | (1.0)
Amortization of actuarial (loss) gain | 0.5 | 0.5 | 0.4
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Foreign exchange rate changes | 0.0 | 0.0 | 0.0
Total recognized in other comprehensive income (loss) | 0.0 | 0.5 | (0.6)
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) | $ (0.4) | $ 0.1 | $ (0.8)

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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL34724391-108580 Reference 2: 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=123447040&loc=d3e1928-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e689-108580 Reference 4: 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=124509347&loc=d3e637-108580 + Details
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