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EMPLOYEE BENEFIT PLANS - Schedule of Information Regarding Defined Benefit Pension Plans (Details) - Defined benefit pension plans - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in projected benefit obligation: |  |  |
Beginning of year | $ 126.2 | $ 105.2 |
Service cost | 6.5 | 6.3 | $ 5.2
Interest cost | 0.4 | 0.5 | 0.9
Participant contributions | 1.5 | 1.5 |
Actuarial loss | (6.1) | 2.9 |
Benefits paid | (2.5) | (0.6) |
Plan amendment | (0.5) | 0.0 |
Currency exchange rate changes and other | (7.6) | 10.4 |
End of year | 117.9 | 126.2 | 105.2
Change in fair value of plan assets: |  |  |
Beginning of year | 73.3 | 63.2 |
Actual return on plan assets | 5.8 | 0.4 |
Employer contributions | 3.1 | 2.8 |
Participant contributions | 1.5 | 1.5 |
Benefits paid | (2.5) | (0.6) |
Currency exchange rate changes and other | (4.3) | 6.0 |
End of year | 76.9 | 73.3 | 63.2
Funded Status |  |  |
Projected benefit obligation | (117.9) | (126.2) | (105.2)
Plan assets at fair value | 76.9 | 73.3 | $ 63.2
Underfunded status | (41.0) | (52.9) |
Accumulated other comprehensive loss, net of tax: |  |  |
Net actuarial loss | (16.4) | (30.8) |
Net prior service cost | 6.0 | 6.6 |
Deferred income tax benefit | 2.4 | 4.6 |
Total | (8.0) | (19.6) |
Other long-term liabilities |  |  |
Net amounts recognized on the consolidated balance sheet: |  |  |
Other long-term liabilities | $ 41.0 | $ 52.9 |

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- Definition Amount, after 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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=123447040&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 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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