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Debt - Additional Information (Detail)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Sep. 26, 2015
USD ($)
Sep. 26, 2015
EUR (€)
Sep. 02, 2015
USD ($)
Dec. 31, 2014
USD ($)
Oct. 03, 2014
USD ($)
Debt Disclosure [Line Items]              
Debt transaction cost paid   $ 0.0          
Commercial paper outstanding $ 179.5         $ 987.6  
Compliance with debt agreement financial covenants we were in compliance with all financial covenants in our debt agreements.            
Future minimum lease payments $ 0.8            
Imputed interest 0.1            
Debt, Long-term and Short-term, Combined Amount 4,710.0         3,004.1  
CPT              
Debt Disclosure [Line Items]              
Capital lease obligation cost 14.7         19.5  
Accumulated amortization 2.9         2.4  
Other Credit Facilities              
Debt Disclosure [Line Items]              
Credit facility maximum borrowing capacity 50.6            
Line of credit facility, amount outstanding $ 0.0            
Minimum              
Debt Disclosure [Line Items]              
Debt agreement financial covenant, leverage ratio 3.50            
Maximum              
Debt Disclosure [Line Items]              
Cost and expenses incurred in connection with acquisition $ 25.0            
Debt agreement financial covenant, leverage ratio 3.00            
Senior Notes, 5.000% Due 2021 | Senior Notes              
Debt Disclosure [Line Items]              
Debt, Weighted Average Interest Rate 5.00%            
Debt, Long-term and Short-term, Combined Amount $ 500.0         500.0  
Senior Notes 1.350% due 2015 | Senior Notes              
Debt Disclosure [Line Items]              
Debt, Weighted Average Interest Rate 1.35%            
Debt, Long-term and Short-term, Combined Amount $ 0.0         350.0  
Senior Notes 2.650% due 2019 | Senior Notes              
Debt Disclosure [Line Items]              
Debt, Weighted Average Interest Rate 2.65%            
Debt, Long-term and Short-term, Combined Amount $ 250.0         250.0  
Senior Notes 3.150% due 2022 | Senior Notes              
Debt Disclosure [Line Items]              
Debt, Weighted Average Interest Rate 3.15%            
Debt, Long-term and Short-term, Combined Amount $ 550.0         550.0  
Senior Notes 1.875 % due 2017 | Senior Notes              
Debt Disclosure [Line Items]              
Debt, Weighted Average Interest Rate 1.875%            
Debt, Long-term and Short-term, Combined Amount $ 350.0         350.0  
Senior Notes Two Point Nine Percent Due Twenty Eighteen [Member] | Senior Notes              
Debt Disclosure [Line Items]              
Debt, Weighted Average Interest Rate 2.90%   2.90% 2.90%      
Debt, Long-term and Short-term, Combined Amount $ 500.0   $ 500.0     0.0  
Senior Notes Three Point Six Two Five Percent Due Twenty Twenty [Member] | Senior Notes              
Debt Disclosure [Line Items]              
Debt, Weighted Average Interest Rate 3.625%   3.625% 3.625%      
Debt, Long-term and Short-term, Combined Amount $ 400.0   $ 400.0     0.0  
Senior Notes Four Point Six Five Percent Due Twenty Twenty Five [Member] | Senior Notes              
Debt Disclosure [Line Items]              
Debt, Weighted Average Interest Rate 4.65%   4.65% 4.65%      
Debt, Long-term and Short-term, Combined Amount $ 250.0   $ 250.0     0.0  
Senior Notes Two Point Four Five Percent Due Twenty Nineteen [Member] | Senior Notes              
Debt Disclosure [Line Items]              
Debt, Weighted Average Interest Rate 2.45%   2.45% 2.45%      
Debt, Long-term and Short-term, Combined Amount $ 548.4     € 500.0   $ 0.0  
Subsidiary Issuer              
Debt Disclosure [Line Items]              
Ownership percentage 100.00%            
Debt transaction cost paid   $ 0.0          
Subsidiary Issuer | Senior Notes, 5.000% Due 2021              
Debt Disclosure [Line Items]              
Debt, interest rate     5.00% 5.00%      
Subsidiary Issuer | Senior Notes 1.350% due 2015              
Debt Disclosure [Line Items]              
Debt, interest rate     1.35% 1.35%      
Subsidiary Issuer | Senior Notes One Point Eight Seven Five Percent Due Twenty Seventeen [Member]              
Debt Disclosure [Line Items]              
Debt, interest rate     1.875% 1.875%      
Subsidiary Issuer | Senior Notes 2.650% due 2019              
Debt Disclosure [Line Items]              
Debt, interest rate     2.65% 2.65%      
Subsidiary Issuer | Senior Notes 3.150% due 2022              
Debt Disclosure [Line Items]              
Debt, interest rate     3.15% 3.15%      
Pentair, Inc [Member] | Senior Notes, 5.000% Due 2021              
Debt Disclosure [Line Items]              
Aggregate principal amount     $ 127.0        
Pentair Finance S.A. [Member] | Senior Notes, 5.000% Due 2021              
Debt Disclosure [Line Items]              
Aggregate principal amount     $ 373.0        
Revolving Credit Facility [Member]              
Debt Disclosure [Line Items]              
Remaining availability under Credit Facility $ 1,139.1            
Credit facility maximum borrowing capacity         $ 2,500.0   $ 2,100.0
Revolving Credit Facility [Member] | Maximum              
Debt Disclosure [Line Items]              
Remaining availability under Credit Facility $ 640.6