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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent [1] 20.30% 21.00% 7.80%  
Gross unrecognized tax benefits $ 69.9 $ 62.1 $ 60.8 $ 53.4
Amount of tax benefits that, if recognized, would impact the effective tax rate 66.2      
Payment of penalties 2.6 1.2    
Payment of interest expense 10.8 9.8    
Deferred taxes on undistributed earnings of certain subsidiaries 11.1      
Tax loss carryforwards 1,419.6      
Deferred tax assets, valuation allowance 362.5 $ 235.8    
Non-U.S. tax losses available for carry forward 1,339.6      
U.S. federal loss available for carry forward 0.0      
State tax losses available for carry forward $ 80.0      
Shared tax liabilities description
Costs and expenses associated with the management of Shared Tax Liabilities will generally be shared 20% by us, 27.5% by ADT and 52.5% by Tyco
      
Minimum        
Income Taxes [Line Items]        
Possible amount of decrease during the next twelve months primarily as a result of the resolution of federal, state and foreign examinations and the expiration of various statutes of limitations $ 0.0      
Maximum        
Income Taxes [Line Items]        
Possible amount of decrease during the next twelve months primarily as a result of the resolution of federal, state and foreign examinations and the expiration of various statutes of limitations $ 32.6      
Operating loss carryforwards expiration year 2035      
2012 Tax Sharing Agreement        
Income Taxes [Line Items]        
Shared tax liabilities description
Tyco is responsible for the first $500 million of Shared Tax Liabilities. As of December 31, 2015, Tyco has paid $63.0 million of Shared Tax Liabilities. We and ADT will share 42% and 58%, respectively, of the next $225 million of Shared Tax Liabilities. We, ADT and Tyco will share 20%, 27.5% and 52.5%, respectively, of Shared Tax Liabilities above $725 million.
      
Foreign Country        
Income Taxes [Line Items]        
Deferred tax assets, valuation allowance $ 326.0      
ADT        
Income Taxes [Line Items]        
Percentage of shared tax liabilities 27.50%      
Adt Corporation and Pentair        
Income Taxes [Line Items]        
Tax sharing, liability $ 225.0      
Tyco        
Income Taxes [Line Items]        
Tax sharing, liability 500.0      
Tax Sharing, Liability, Paid $ 63.0      
Percentage of shared tax liabilities 52.50%      
Pentair [Member]        
Income Taxes [Line Items]        
Percentage of shared tax liabilities 20.00%      
Pentair ADT Tyco        
Income Taxes [Line Items]        
Tax sharing, liability $ 725.0      
Tax Liability | Tyco        
Income Taxes [Line Items]        
Tax sharing, liability 883.3      
Tax Penalties | Tyco        
Income Taxes [Line Items]        
Tax sharing, liability 154.0      
Period One | Tyco        
Income Taxes [Line Items]        
Disallowed interest and related tax deductions 2,900.0      
Period Two | Tyco        
Income Taxes [Line Items]        
Disallowed interest and related tax deductions $ 6,600.0      
Group One [Member] | 2012 Tax Sharing Agreement        
Income Taxes [Line Items]        
Percentage of shared tax liabilities 42.00%      
Group One [Member] | ADT | 2012 Tax Sharing Agreement        
Income Taxes [Line Items]        
Percentage of shared tax liabilities 58.00%      
Group One [Member] | Tyco | Agreement Two Member [Member]        
Income Taxes [Line Items]        
Percentage of shared tax liabilities 27.00%      
Group One [Member] | Covidien | Agreement Two Member [Member]        
Income Taxes [Line Items]        
Percentage of shared tax liabilities 42.00%      
Group One [Member] | TE Connectivity | Agreement Two Member [Member]        
Income Taxes [Line Items]        
Percentage of shared tax liabilities 31.00%      
Group Two [Member] | 2012 Tax Sharing Agreement        
Income Taxes [Line Items]        
Percentage of shared tax liabilities 20.00%      
Group Two [Member] | ADT | 2012 Tax Sharing Agreement        
Income Taxes [Line Items]        
Percentage of shared tax liabilities 27.50%      
Group Two [Member] | Tyco | 2012 Tax Sharing Agreement        
Income Taxes [Line Items]        
Percentage of shared tax liabilities 52.50%      
UNITED KINGDOM        
Income Taxes [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 20.00% 21.00%    
SWITZERLAND        
Income Taxes [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     7.80%  
[1] The statutory rate for 2015 and 2014 reflects the U.K. statutory rate of 20.25 percent and 21 percent, respectively. For 2013, the statutory rate reflects the Swiss statutory rate of 7.8 percent.