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LEASES AND PROPERTY, PLANT AND EQUIPMENT - Maturities of Lease Liabilities (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Operating Leases  
April 2020 through December 2020 $ 26.4
2021 32.8
2022 26.2
2023 21.9
2024 16.5
Thereafter 46.7
Total undiscounted cash flows 170.5
Short-term lease liability 19.2
Long-term lease liability 89.2
Total lease liability 108.4
Difference between undiscounted cash flows and discounted cash flows 62.1
Finance Leases  
April 2020 through December 2020 0.5
2021 0.5
2022 0.3
2023 0.0
2024 0.0
Thereafter 0.0
Total undiscounted cash flows 1.3
Short-term lease liability 0.5
Long-term lease liability 0.4
Total lease liability 0.9
Difference between undiscounted cash flows and discounted cash flows $ 0.4