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LEASES - FUTURE MINIMUM LEASE PAYMENTS (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Total operating leases      
Three months ended December 31, 2019 $ 1.1    
2020 6.9    
2021 4.9    
2022 4.9    
2023 5.0    
2024 4.8    
Thereafter 30.5    
Total minimum lease payments 58.1    
Less: interest (14.9)    
Present value of minimum lease payments 43.2 $ 48.8  
Less: short-term lease liabilities (4.4)    
Long-term lease liabilities 38.8    
Finance leases      
Three months ended December 31, 2019 2.2    
2020 9.4    
2021 10.3    
2022 5.1    
2023 0.9    
2024 1.0    
Thereafter 80.5    
Total minimum lease payments 109.4    
Less: interest (61.0)    
Present value of minimum lease payments 48.4    
Less: short-term lease liabilities (5.9)    
Long-term lease liabilities 42.5    
Capital lease      
Short-term liabilities under capital lease     $ 4.9
Long-term liabilities under capital lease     $ 18.4
Power Purchase Contract      
Finance leases      
Three months ended December 31, 2019 2.0    
2020 8.8    
2021 9.4    
2022 4.2    
2023 0.0    
2024 0.0    
Thereafter 0.0    
Total minimum lease payments 24.4    
Less: interest (4.7)    
Present value of minimum lease payments 19.7    
Less: short-term lease liabilities (5.9)    
Long-term lease liabilities 13.8    
Two Creeks Solar Project      
Finance leases      
Three months ended December 31, 2019 0.1    
2020 0.2    
2021 0.2    
2022 0.2    
2023 0.2    
2024 0.2    
Thereafter 22.8    
Total minimum lease payments 23.9    
Less: interest (16.2)    
Present value of minimum lease payments 7.7    
Less: short-term lease liabilities 0.0    
Long-term lease liabilities 7.7    
Badger Hollow Solar Farm I      
Finance leases      
Three months ended December 31, 2019 0.1    
2020 0.4    
2021 0.7    
2022 0.7    
2023 0.7    
2024 0.8    
Thereafter 57.7    
Total minimum lease payments 61.1    
Less: interest (40.1)    
Present value of minimum lease payments 21.0    
Less: short-term lease liabilities 0.0    
Long-term lease liabilities $ 21.0