BASIS OF PRESENTATION - Other Expense (Income) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
|
| BASIS OF PRESENTATION | ||
| Derivative liability fair value adjustment for embedded conversion feature in the Convertible Notes | $ (0.5) | |
| Derivative asset fair value adjustment for contingent call option related to the Class B common stock purchase and cancellation agreement | 20.1 | |
| Credit losses (gain) related to contingent lease guarantees | $ (2.0) | 5.3 |
| Governmental assistance due to COVID-19 | (12.4) | |
| Foreign currency transaction (gains) losses | (3.8) | 2.0 |
| Non-operating components of net periodic benefit cost | (0.2) | |
| Financing fees related to modification of debt | 1.0 | |
| Total other expense (income) | $ (17.4) | $ 26.9 |