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LEASES - FUTURE MINIMUM LEASE PAYMENTS (Details) - Badger Hollow Solar Park II $ in Millions	Sep. 30, 2020 USD ($)
Finance leases
2021	$ 0.3
2022	0.3
2023	0.7
2024	0.7
2025	0.7
Thereafter	55.0
Total minimum lease payments	57.7
Less: interest	(34.8)
Present value of minimum lease payments	22.9
Less: short-term lease liabilities	0.0
Long-term lease liabilities	$ 22.9

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