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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent [1] 20.00% 20.30% 21.00%  
Gross unrecognized tax benefits $ 71.1 $ 45.6 $ 40.3 $ 39.5
Amount of tax benefits that, if recognized, would impact the effective tax rate 68.3      
Gross increases for tax positions in prior periods 27.4 4.7 $ 0.8  
Payment of penalties 2.4 2.3    
Payment of interest expense 11.0 7.9    
Tax loss carryforwards 1,462.4      
Deferred tax assets, valuation allowance 380.8 $ 286.5    
Non-U.S. tax losses available for carry forward 1,388.0      
U.S. federal loss available for carry forward 0.0      
State tax losses available for carry forward $ 74.4      
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
     
other liabilities tax sharing $ 13.3      
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 $ 42.2      
Operating loss carryforwards expiration year 2036      
2012 Tax Sharing Agreement        
Income Taxes [Line Items]        
Shared tax liabilities description
Johnson Controls is responsible for the first $500 million of Shared Tax Liabilities. As of December 31, 2016, Johnson Controls has paid $210.0 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 Johnson Controls 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 $ 378.9      
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 $ 210.0      
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      
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 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%      
[1] The statutory rate for 2016, 2015 and 2014 reflects the U.K. statutory rate of 20.0 percent, 20.3 percent and 21.0 percent, respectively.