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Acquisitions and Divestitures - Additional Information (Detail) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended |  | 1 Months Ended
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Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2013 Maximum USD ($) | Dec. 31, 2012 Process Technologies USD ($) | Dec. 31, 2011 Process Technologies USD ($) | Dec. 31, 2013 Flow Technologies USD ($) | Dec. 31, 2013 Technical Solutions USD ($) | Sep. 28, 2012 Tyco Flow Control International, Ltd USD ($) | Dec. 31, 2012 Tyco Flow Control International, Ltd USD ($) | Dec. 31, 2011 Tyco Flow Control International, Ltd USD ($) | Sep. 28, 2012 Tyco Flow Control International, Ltd Valves & Controls USD ($) | Sep. 28, 2012 Tyco Flow Control International, Ltd Process Technologies USD ($) | Sep. 28, 2012 Tyco Flow Control International, Ltd Flow Technologies USD ($) | Sep. 28, 2012 Tyco Flow Control International, Ltd Technical Solutions USD ($) | May 12, 2011 CPT USD ($) | May 12, 2011 CPT EUR (€) | Dec. 31, 2011 CPT USD ($) | Oct. 04, 2012 Pentair Middle East Holding S.a.r.l. USD ($) | Dec. 31, 2013 Pentair Ltd. USD ($) | Dec. 31, 2012 Change In Control Of Company Tyco Flow Control International, Ltd USD ($) | Dec. 31, 2011 Change In Control Of Company Tyco Flow Control International, Ltd USD ($) | Dec. 31, 2012 Transaction Costs Tyco Flow Control International, Ltd USD ($) | Dec. 31, 2011 Transaction Costs Tyco Flow Control International, Ltd USD ($) | Dec. 31, 2011 Transaction Costs CPT USD ($) | Jan. 30, 2014 Subsequent Event Pentair Residential Filtration [Member] USD ($) | Sep. 28, 2012 Trade names intangibles Tyco Flow Control International, Ltd USD ($) | Sep. 28, 2012 Customer Backlog Tyco Flow Control International, Ltd USD ($) | Sep. 28, 2012 Customer Backlog Tyco Flow Control International, Ltd Maximum | Sep. 28, 2012 Proprietary technology Tyco Flow Control International, Ltd USD ($) | Sep. 28, 2012 Customer Relationship Tyco Flow Control International, Ltd USD ($)
Material acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for stock acquisition |  |  |  |  |  |  |  |  | 110,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 80.9 | $ 14.4 |  |  | $ 2,741.8 |  |  |  | $ 1,511.6 | $ 30.1 | $ 318.5 | $ 881.6 | $ 451.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  | 1,441.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 362.3 | 43.7 |  | 115.9 | 920.0
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 13 years 8 months 12 days | 14 years 2 months 12 days
Other material acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  | 121.2 | 21.6 |  |  | 5,016.1 |  |  |  |  |  |  |  | 715.3 | 502.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 197.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma results of material acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Inventory |  |  |  |  |  |  |  |  |  |  | 178.1 | 262.0 |  |  |  |  |  |  | 12.9 |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.8 | 21.8 | 57.3 | 8.7 | 8.0 |  |  |  |  |  |
Percentage Of Ownership Interest Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  | 19.90% |  |  |  |  |
Other acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid |  |  |  |  |  | 17.8 |  |  | 84.4 | [1] |  |  |  |  |  |  |  |  |  | 100.0 |  |  |  |  |  |  | 134.3 |  |  |  |  |
Percentage of ownership interests before acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  | 80.10% |  |  |  |  |
Liabilities incurred |  |  |  |  |  | 3.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected tax deductible goodwill |  |  |  |  | 67.1 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost and expenses incurred in connection with acquisition | 8.2 | 57.3 | 8.2 | 40.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture | 43.5 | 0 | 0 |  |  |  | 13.4 | 30.1 |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Gain on sale of business | 19.7 | 0 | 0 |  |  |  | 2.9 | 16.8 |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Goodwill write-off |  |  |  |  |  |  | $ 5.7 | $ 5.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | In June 2013, cash was paid to Tyco in settlement of the working capital and net indebtedness adjustment.

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