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Acquisitions - Other insignficant acquisitions (Detail) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2015 | Dec. 31, 2014 | Oct. 01, 2014 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2014 | Sep. 30, 2015 | Oct. 31, 2014 | Oct. 06, 2014 | Jan. 02, 2014 | Sep. 30, 2013 | Feb. 14, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated Income tax rate |  |  |  |  | 35.00% | 35.00% |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  |  |  |  | $ 2,478.4 |  | $ 2,487.4 |  |  |  | $ 1,524.8 |
The Liquid Fence Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  |  |  |  |  |  |  | $ 0.1 |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | $ 24.8 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Inventory |  |  |  |  |  |  |  |  |  | 2.1 |  |
Goodwill (Note 12) |  |  | $ 26.9 |  |  |  |  |  |  | 26.9 |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  | 0.1 |  |
Goodwill (Note 12) |  |  |  |  |  |  |  |  |  | 7.1 |  |
Business Combination Purchase Consideration Transferred |  |  |  |  |  | 35.8 |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  |  |  | $ 9.5 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  |  |  |  |  |  |  |  | 1.1 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  |  |  | 1.6 |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  | $ 35.8 |  |
Compass Production Partners [Member] |  |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Percentage Of Equity Interests Acquired |  |  |  |  |  |  |  |  | 25.50% |  |  |
Ability Re [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Insurance Reserves |  |  |  |  |  |  |  | $ (346.9) |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  |  |  |  |  | 8.5 |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | $ 17.9 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Funds Withheld |  |  |  |  |  |  |  | 359.5 |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  | 368.0 |  |  |  |
Business Combination Purchase Consideration Transferred |  |  |  | 19.2 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  | 2.8 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Other |  |  |  | (1.5) |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  |  |  |  |  |  | (1.9) |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  | $ 19.2 |  |  |  |
Tell Manufacturing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 1.1 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Inventory |  |  | 7.2 |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 1.5 |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  |  | 12.5 |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 12.5 |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  |  | 7.1 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 0.6 |  |  |  |  |  |  |  |  |
Business Combination Purchase Consideration Transferred |  |  |  | 30.3 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  | 6.0 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  | (5.7) |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  | 30.3 |  |  |  |  |  |  |  |  |
European IAMS and Eukanuba [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Inventory |  | $ 16.3 |  | 16.3 |  |  |  |  |  |  |  |
Goodwill (Note 12) |  | 39.6 |  | 39.6 |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | 58.3 |  | 58.3 |  |  |  |  |  |  |  |
Goodwill (Note 12) |  | 4.0 |  | 4.0 |  |  |  |  |  |  |  |
Business Combination Purchase Consideration Transferred |  |  |  | 115.7 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  | (2.7) |  | (2.7) |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  | 2.9 |  | 2.9 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | 2.7 |  | 2.7 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | 115.7 |  | 115.7 |  |  |  |  |  |  |  |
Salix Animal Health LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | $ 0.5 |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  | 146.8 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Inventory | 17.0 |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) | 55.5 |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 1.2 |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) | 71.5 |  |  |  |  |  |  |  |  |  |  |
Business Combination Purchase Consideration Transferred |  |  |  |  | 148.3 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  |  | $ 1.5 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 10.7 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | (2.1) |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 2.5 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 8.5 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 148.3 |  |  |  |  |  |  |  |  |  |  |
Compass | EXCO [Member] |  |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Percentage Of Equity Interests Acquired |  |  |  |  |  |  |  |  |  |  |  | 24.50%
Compass | HGI |  |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Percentage Of Equity Interests Acquired |  |  |  |  | 74.40% |  |  |  |  |  |  |
Tradenames Trademarks And Patents [Member] | The Liquid Fence Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  |  | 5.1 |  |  |  |  |  |  |  |  |
Tradenames Trademarks And Patents [Member] | Tell Manufacturing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  |  | 4.0 |  |  |  |  |  |  |  |  |
Tradenames Trademarks And Patents [Member] | European IAMS and Eukanuba [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  | 25.5 |  | 25.5 |  |  |  |  |  |  |  |
Tradenames Trademarks And Patents [Member] | Salix Animal Health LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) | 17.0 |  |  |  |  |  |  |  |  |  |  |
Technology-Based Intangible Assets [Member] | The Liquid Fence Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  |  | $ 20.5 |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 17 years |  |  |  |  |  |  |  |  |
Technology-Based Intangible Assets [Member] | European IAMS and Eukanuba [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  | $ 3.6 |  | $ 3.6 |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 8 years |  |  |  |  |  |  |
Technology-Based Intangible Assets [Member] | Salix Animal Health LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) | $ 2.1 |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 17 years |  |  |  |  |  |  |  |  |  |  |
Licensing Agreements [Member] | Salix Animal Health LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) | $ 1.0 |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 13 years |  |  |  |  |  |  |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated Income tax rate |  |  |  |  | 38.00% |  |  |  |  |  |  |
Customer Relationships [Member] | The Liquid Fence Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  |  | $ 1.3 |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 15 years |  |  |  |  |  |  |  |
Customer Relationships [Member] | Tell Manufacturing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated Income tax rate |  |  | 38.00% |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  |  | $ 8.5 |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 13 years |  |  |  |  |  |  |  |
Customer Relationships [Member] | European IAMS and Eukanuba [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated Income tax rate |  | 25.00% |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) |  | $ 10.5 |  | $ 10.5 |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 15 years |  |  |  |  |  |  |
Customer Relationships [Member] | Salix Animal Health LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated Income tax rate | 38.00% |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (Note 12) | $ 35.4 |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 13 years |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Amortization period, intangible asset |  |  |  |  | 2 years |  |  |  |  |  |  |
Maximum | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |
Amortization period, intangible asset |  |  |  |  | 20 years |  |  |  |  |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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