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RELATED PARTIES - Summary Of Related Party Transactions Table Disclosure (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |  |
Product revenues from related parties | $ 281.8 | $ 452.4 | $ 292.6 |  | $ 499.3 |
Revenues | $ 1,092.7 | $ 743.2 | $ 1,451.8 | [1] | $ 900.2 |
Related party product revenue as a percent of total product revenue | 25.80% | 60.90% | 20.20% | [2] | 55.50% |
Purchases from related parties | $ 9.7 | $ 0.0 | $ 12.2 |  | $ 0.0 |
Realization of deferred revenue | 0.0 | $ 0.0 | 34.6 |  | $ 0.0 |
Trade Accounts Receivable [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Due from Related Parties, Current | 91.6 |  | 91.6 |  |  | $ 31.1
Other Current Assets [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Due from Related Parties, Current | 35.3 |  | 35.3 |  |  | 44.5
Accounts Payable [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Due to Related Parties, Current | (2.4) |  | (2.4) |  |  | 0.0
Other Current Liabilities [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Due to Related Parties, Current | $ (2.0) |  | $ (2.0) |  |  | $ (2.0)
[1] | Includes Realization of deferred revenue of $34.6 million for the six months ended June 30, 2020.
[2] | Includes Realization of deferred revenue of $34.6 million for the six months ended June 30, 2020.

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