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SUPPLEMENTAL BALANCE SHEET INFORMATION - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract] |  |  |  |  |
Employee termination benefits obligations | $ 17.4 |  | $ 17.4 |  | $ 48.4
Charges for employee termination benefitsd | 13.1 | $ 24.1 | 38.3 | $ 41.7 |
Share-based compensation expense associated with equity awards held by terminated employees | 0.7 | $ 1.7 | 1.2 | $ 4.2 |
Cumulative charges for employee termination benefits | 178.7 |  | 178.7 |  |
Cumulative charges for employee termination benefits related to share-based compensation expense | $ 25.2 |  | $ 25.2 |  |

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- Definition Amount of noncash expense (reversal of expense) for employee benefits and share-based payment arrangement. Includes, but is not limited to, pension, other postretirement, postemployment and termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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