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LEASES - FUTURE MINIMUM LEASE PAYMENTS (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Finance leases    
Long-term lease finance liabilities $ 364.2 $ 303.3
WECI | Hardin Solar III Energy Center    
Operating leases    
Three months ended December 31, 2025 0.0  
2026 1.5  
2027 1.5  
2028 1.5  
2029 1.6  
2030 1.6  
Thereafter 113.6  
Total minimum lease payments 121.3  
Less: interest (91.7)  
Present value of minimum lease payments 29.6  
Less: short-term lease liabilities 0.0  
Long-term lease operating liabilities 29.6  
WE and WPS | High Noon    
Finance leases    
Three Months Ended December 31, 2025 0.9  
2026 1.4  
2027 1.8  
2028 3.6  
2029 3.7  
2030 3.8  
Thereafter 290.8  
Total minimum lease payments 306.0  
Less: Interest (240.1)  
Present value of minimum lease payments 65.9  
Less: short-term lease liabilities 0.0  
Long-term lease finance liabilities $ 65.9