v3.26.1
FAIR VALUE MEASUREMENTS (Details) - EBP 002 - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
NAV redemption, notice period 12 months  
Total investments at fair value $ 992,149,624 $ 901,232,118
Level 1, Level 2, and Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 149,513,173 144,876,446
Level 1, Level 2, and Level 3 | Pentair common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 50,460,578 54,118,380
Level 1, Level 2, and Level 3 | Interest-bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 318,195 187,320
Level 1, Level 2, and Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 98,734,400 90,570,746
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 149,513,173 144,876,446
Level 1 | Pentair common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 50,460,578 54,118,380
Level 1 | Interest-bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 318,195 187,320
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 98,734,400 90,570,746
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Pentair common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Interest-bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Pentair common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Interest-bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Investments valued at NAV    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 842,636,451 $ 756,355,672