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Debt - Additional Information (Detail) € in Millions, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€) | Sep. 02, 2015 USD ($) | Oct. 03, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 4,411.3 | $ 4,685.8 |  |  |
Compliance with debt agreement financial covenants | we were in compliance with all financial covenants in our debt agreements |  |  |  |
Subsidiary Issuer |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Ownership percentage | 100.00% |  |  |  |
Subsidiary Issuer | Senior Notes 1.875% Due 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, interest rate | 1.875% |  |  |  |
Subsidiary Issuer | Senior Notes 2.650% Due 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, interest rate | 2.65% |  |  |  |
Subsidiary Issuer | Senior Notes 5.000% Due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, interest rate | 5.00% |  |  |  |
Subsidiary Issuer | Senior Notes 3.150% Due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, interest rate | 3.15% |  |  |  |
Pentair, Inc [Member] | Senior Notes 5.000% Due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 127.0 |  |  |  |
Pentair Finance S.A. [Member] | Senior Notes 5.000% Due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | 373.0 |  |  |  |
Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Costs and expenses incurred in connection with acquisition excluded from computation of Net Income figure used in our debt covenant calculation | $ 25.0 |  |  |  |
Debt agreement financial covenant, leverage ratio | 3.5 |  |  |  |
Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt agreement financial covenant, leverage ratio | 4.0 |  |  |  |
Other Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility maximum borrowing capacity | $ 51.9 |  |  |  |
Line of credit facility, amount outstanding | 0.0 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility maximum borrowing capacity |  |  |  | $ 2,500.0 | $ 2,100.0
Remaining availability under Credit Facility | 1,430.2 |  |  |  |
Revolving Credit Facility [Member] | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Remaining availability under Credit Facility | 733.6 |  |  |  |
Commercial Paper [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 454.3 | 179.5 |  |  |
Debt, Weighted Average Interest Rate | 1.755% |  |  |  |
Senior Notes [Member] | Senior Notes 2.900% Due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 500.0 | $ 500.0 |  |  |
Debt, Weighted Average Interest Rate | 2.90% | 2.90% | 2.90% |  |
Senior Notes [Member] | Senior Notes 1.875% Due 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 350.0 | $ 350.0 |  |  |
Debt, Weighted Average Interest Rate | 1.875% |  |  |  |
Senior Notes [Member] | Senior Notes 2.650% Due 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 250.0 | 250.0 |  |  |
Debt, Weighted Average Interest Rate | 2.65% |  |  |  |
Senior Notes [Member] | Senior Notes 5.000% Due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 500.0 | 500.0 |  |  |
Debt, Weighted Average Interest Rate | 5.00% |  |  |  |
Senior Notes [Member] | Senior Notes 3.150% Due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 550.0 | 550.0 |  |  |
Debt, Weighted Average Interest Rate | 3.15% |  |  |  |
Senior Notes [Member] | Senior Notes 3.625% Due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 400.0 | $ 400.0 |  |  |
Debt, Weighted Average Interest Rate | 3.625% | 3.625% | 3.625% |  |
Senior Notes [Member] | Senior Notes 4.65% Due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 250.0 | $ 250.0 |  |  |
Debt, Weighted Average Interest Rate | 4.65% | 4.65% | 4.65% |  |
Senior Notes [Member] | Senior Notes 2.45% Due 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount | $ 560.8 | $ 548.4 | € 500.0 |  |
Debt, Weighted Average Interest Rate | 2.45% | 2.45% | 2.45% |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64801991&loc=SL6759159-111685 + Details
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