The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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LEASES - Lessor (Details) - USD ($) $ in Millions	12 Months Ended
LEASES - Lessor (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessor, Lease, Description [Line Items]
Depreciation	$ 91.1	$ 132.2	$ 114.4
Lease income	25.0	24.2
Asset Leased Under Operating Leases
Lessor, Lease, Description [Line Items]
Depreciation	$ 18.7	$ 20.5
Asset Leased Under Operating Leases \| Minimum
Lessor, Lease, Description [Line Items]
Terms	30 months
Asset Leased Under Operating Leases \| Maximum
Lessor, Lease, Description [Line Items]
Terms	72 months