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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 23, 2020 | Sep. 08, 2020 | May 12, 2020 | Jun. 27, 2019
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Liabilities | $ 1,654.5 | $ 1,608.8 |  |  |  |
Assets | 3,971.6 | 4,154.3 |  |  |  |
Recurring fair value measurement |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Liabilities | 498.0 | 524.6 |  |  |  |
Assets | 728.6 | 1,078.1 |  |  |  |
Recurring fair value measurement | Embedded derivative |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Liabilities | 29.2 | 23.3 |  |  |  |
Marketable securities and warrants | Recurring fair value measurement |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Assets | 40.4 | 16.4 |  |  |  |
Embedded derivative | Recurring fair value measurement |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Assets | 1.5 | 8.4 |  |  |  |
Level 3 | Recurring fair value measurement |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Liabilities | 0.0 | 0.0 |  |  |  |
Assets | 19.3 | 14.7 |  |  |  |
Level 3 | Recurring fair value measurement | Embedded derivative |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Liabilities | 0.0 | 0.0 |  |  |  |
Level 3 | Marketable securities and warrants | Recurring fair value measurement |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Assets | 0.4 | 0.4 |  |  |  |
Reduction in value of marketable securities | 0.0 |  |  |  |  |
Change in fair value reported in OCI, net of income taxes | 0.0 |  |  |  |  |
Level 3 | Embedded derivative | Recurring fair value measurement |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Assets | $ 0.0 | $ 0.0 |  |  |  |
5.75% senior notes | Fixed interest rate |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Interest rate | 5.75% | 5.75% | 5.75% |  |  |
5.75% senior notes | Recurring fair value measurement | Long-term debt |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Liabilities | $ 446.0 |  |  |  |  |
5.75% senior notes | Level 3 | Recurring fair value measurement | Long-term debt |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Liabilities | 0.0 |  |  |  |  |
7.0% Senior Notes | Fixed interest rate |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Interest rate |  | 7.00% |  | 7.00% |  |
7.0% Senior Notes | Recurring fair value measurement | Long-term debt |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Liabilities |  | $ 460.4 |  |  |  |
Equipment loans |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Interest rate |  |  |  |  | 5.95% | 5.23%
Equipment loans | Recurring fair value measurement | Long-term debt |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Liabilities | 19.1 | 28.9 |  |  |  |
Equipment loans | Level 3 | Recurring fair value measurement | Long-term debt |  |  |  |  |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |  |  |  |
Liabilities | $ 0.0 | $ 0.0 |  |  |  |

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