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Debt - Additional Information (Detail)
€ in Millions
1 Months Ended 6 Months Ended
Apr. 25, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
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      
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   707,400,000   $ 707,400,000      
Debt   $ 14,600,000   14,600,000   $ 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   1.00      
EBITDA ratio for debt   3.00   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   3.75      
EBITDA ratio for debt   1.00   1.00      
Commercial Paper              
Debt Instrument [Line Items]              
Commercial paper   $ 78,000,000   $ 78,000,000   34,000,000  
Senior Notes | Senior Notes 2.900% Due 2018              
Debt Instrument [Line Items]              
Debt   $ 0   $ 0   255,300,000  
Interest rate   2.90%   2.90%      
Senior Notes | Senior Notes 2.45% Due 2019              
Debt Instrument [Line Items]              
Debt   $ 157,900,000   $ 157,900,000   $ 594,400,000  
Cash tender offer | €     € 363.4        
Interest rate   2.45%   2.45%     2.45%
Premium paid   $ 16,000,000          
Write off of deferred debt issuance cost   1,100,000          
Other Credit Facilities              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity   24,600,000.0   $ 24,600,000.0      
Line of credit facility, amount outstanding   $ 0   $ 0