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Debt - Additional Information (Detail)
€ in Millions
1 Months Ended 9 Months Ended
Apr. 25, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
EUR (€)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2015
Debt Instrument [Line Items]              
Distribution of cash from nVent   $ 993,600,000   $ 993,600,000 $ 0    
Leverage ratio covenant period       12 months      
Debt       $ 798,800,000   $ 1,440,700,000  
Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt term 5 years            
Credit facility maximum borrowing capacity $ 800,000,000.0            
Optional line of credit limit increase $ 300,000,000.0            
Remaining borrowing capacity       691,600,000      
Debt       9,400,000   28,400,000  
Line of Credit | Revolving Credit Facility | Maximum              
Debt Instrument [Line Items]              
Debt covenant, unrestricted cash       $ 250,000,000.0      
Debt agreement financial covenant, leverage ratio       1.00      
EBITDA ratio for debt       3.00      
Line of Credit | Revolving Credit Facility | Minimum              
Debt Instrument [Line Items]              
Debt covenant, unrestricted cash       $ 5,000,000.0      
Debt agreement financial covenant, leverage ratio       3.75      
EBITDA ratio for debt       1.00      
Commercial Paper              
Debt Instrument [Line Items]              
Commercial paper       $ 99,000,000   34,000,000  
Senior Notes | Senior Notes 2.900% Due 2018              
Debt Instrument [Line Items]              
Debt       $ 0   255,300,000  
Interest rate       2.90%      
Senior Notes | Senior Notes 2.45% Due 2019              
Debt Instrument [Line Items]              
Debt       $ 160,400,000   $ 594,400,000  
Cash tender offer | €     € 363.4        
Interest rate       2.45%     2.45%
Premium paid   16,000,000          
Write off of deferred debt issuance cost   $ 1,100,000          
Other Credit Facilities [Member]              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity       $ 21,100,000.0      
Borrowings outstanding       $ 0