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Business Acquisitions - Schedule of Business Acquisition, Pro Forma Information (Details) - NSI Industries - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Business Combination, Pro Forma Information [Line Items]      
Net sales $ 1,638.0 $ 5,347.6 $ 4,729.2
Net income attributable to Hubbell $ 233.7 $ 697.4 $ 560.0