LEASES - Cash flow and supplemental information (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Cash paid for amounts included in the measurement of lease liabilities: | |||
| Operating cash flows used in finance leases | $ (2.9) | $ (3.2) | $ (7.6) |
| Operating cash flows used in operating leases | (883.2) | (446.5) | (941.6) |
| Financing cash flows used in finance leases | (9.0) | (6.2) | (10.9) |
| Landlord contributions: | |||
| Operating cashflows provided by operating leases | 22.0 | 43.6 | 106.5 |
| Supplemental disclosure of noncash leasing activities: | |||
| Right-of-use assets obtained in exchange for new operating lease liabilities | $ 196.6 | $ 201.5 | $ 463.2 |