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v3.21.1

REVENUE (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |  |  |  |  |  |
Accounts Receivable, Less Allowance |  |  |  | $ 2,414.1 | $ 2,078.1 | $ 2,291.5
Contract Assets (Current) |  |  |  | 61.7 | 52.0 |
Contract Assets (Long-Term) |  |  |  | 157.2 | 170.7 |
Other accruals |  |  |  | 182.6 | 266.3 |
Other long-term liabilities |  |  |  | 8.4 | 8.2 |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 53.5 | $ 36.5 |  |  |  |
Adjustment upon adoption of ASU 2016-13 | 58.8 | 60.2 | $ 36.5 | $ 58.8 | $ 53.5 | $ 60.2
Bad debt expense | 6.4 | 30.2 |  |  |  |
Uncollectible accounts written off, net of recoveries | (1.1) | (9.5) |  |  |  |
Ending balance | $ 58.8 | $ 60.2 | $ 36.5 |  |  |
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member |  |  |
Revenue, performance obligation, description of payment terms | 30 and 60 days, |  |  |  |  |
Cumulative effect, period of adoption, adjustment |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance |  | $ 3.0 |  |  |  |
Adjustment upon adoption of ASU 2016-13 |  | $ 3.0 | $ 3.0 |  |  |
Ending balance |  |  | $ 3.0 |  |  |

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