v3.26.1
Consolidated Balance Sheets (Unaudited) - SPPC (Parenthetical) - $ / shares
Mar. 31, 2026
Dec. 31, 2025
Common stock, shares authorized (in shares) 100 100
Common stock, shares issued (in shares) 1 1
Common stock, shares outstanding (in shares) 1 1
SPPC    
Common stock, par value (in dollars per share) $ 3.75 $ 3.75
Common stock, shares authorized (in shares) 1,000 1,000
Common stock, shares issued (in shares) 1,000 1,000
Common stock, shares outstanding (in shares) 1,000 1,000