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Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Jan. 16, 2015	Dec. 31, 2014	Oct. 31, 2014	Oct. 01, 2014	Jun. 30, 2015	Dec. 31, 2014	Mar. 31, 2015	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	May. 21, 2015	Oct. 06, 2014	May. 30, 2014	Jan. 02, 2014	Mar. 05, 2013	Feb. 14, 2013	Apr. 06, 2011
Business Acquisition [Line Items]
Goodwill (Note 12)									$ 2,487.4	$ 1,524.8	$ 1,476.7
Estimated Income tax rate									35.00%	35.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain									$ 141.2	$ 0.0	0.0
Cash consideration									$ 1,320.0	27.2	2,014.8
Payments to Acquire Businesses, Gross										1.5
FGL
Business Acquisition [Line Items]
Percentage Of Ownership Interest									80.50%
HGI
Business Acquisition [Line Items]
Acquisition related charges									$ 0.4	4.2	$ 12.7
Compass Production Partners [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred							$ 118.8
Technology Assets [Member] | Minimum [Member]
Business Acquisition [Line Items]
Amortization period, intangible asset									4 years
Technology Assets [Member] | Maximum
Business Acquisition [Line Items]
Amortization period, intangible asset									18 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Retention Rate									95.00%
Estimated Income tax rate									38.00%
Business Acquisition Contingent Consideration Key Assumptions Discount Rate									9.50%
Customer Relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Amortization period, intangible asset									2 years
Customer Relationships [Member] | Maximum
Business Acquisition [Line Items]
Amortization period, intangible asset									20 years
Compass Production Partners G.P. [Member]
Business Acquisition [Line Items]
Business Acquisition Percentage Of Equity Interests Acquired									100.00%
AAG Acquisition [Member]
Business Acquisition [Line Items]
Goodwill (Note 12)												$ 972.1
Property, plant and equipment												38.3
Goodwill (Note 12)												418.0
Inventory												84.2
Business Combination, Consideration Transferred					$ 929.3
Payments to Acquire Businesses, Gross					$ 0.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net												929.3
Business Acquisition, Pro Forma Net Income (Loss)									$ (517.5)	(71.4)
Business Acquisition, Goodwill, Expected Tax Deductible Amount												4.9
AAG Acquisition [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									15 years
Goodwill (Note 12)												63.0
AAG Acquisition [Member] | Customer Relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate									2.00%
AAG Acquisition [Member] | Customer Relationships [Member] | Maximum
Business Acquisition [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate									12.10%
AAG Acquisition [Member] | Tradenames Trademarks And Patents [Member]
Business Acquisition [Line Items]
Goodwill (Note 12)												$ 295.0
EXCO [Member] | EXCO/HGI General Partner
Business Acquisition [Line Items]
Business Acquisition Percentage Of Equity Interests Acquired																	50.00%
Compass | EXCO [Member]
Business Acquisition [Line Items]
Business Acquisition Percentage Of Equity Interests Acquired																	24.50%
Business Combination Purchase Consideration Transferred																	$ 725.0
Non-controlling interest																	119.1
Compass | HGI
Business Acquisition [Line Items]
Business Acquisition Percentage Of Equity Interests Acquired									74.40%
Business Combination Purchase Consideration Transferred																	349.8
Preliminary working capital and other adjustments																	30.5
Business combination, assets acquired																	694.5
Compass | Compass
Business Acquisition [Line Items]
Business Combination Purchase Consideration Transferred																	$ 574.8
Compass | HGI Energy Holdings, LLC
Business Acquisition [Line Items]
Business Acquisition Percentage Of Equity Interests Acquired																	73.50%
Compass | EXCO/HGI General Partner
Business Acquisition [Line Items]
Business Acquisition Percentage Of Equity Interests Acquired																	2.00%
Cotton-Valley Oil and Gas Properties | HGI
Business Acquisition [Line Items]
Business combination, assets acquired																$ 130.7
Fidelity And Guaranty Life Holdings
Business Acquisition [Line Items]
Business Acquisition Fair Value Of Contingent Purchase Price Consideration Reduction																		$ 50.0
The Liquid Fence Company [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Other										1.5
Goodwill (Note 12)															$ 7.1
Property, plant and equipment															0.1
Business Combination, Consideration Transferred, Liabilities Incurred										9.5
Goodwill (Note 12)				$ 26.9											26.9
Inventory															2.1
Business Combination, Consideration Transferred										35.8
Payments to Acquire Businesses, Gross										$ 24.8
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest															35.8
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net															$ 35.8
The Liquid Fence Company [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life						15 years
Goodwill (Note 12)				1.3
The Liquid Fence Company [Member] | Tradenames Trademarks And Patents [Member]
Business Acquisition [Line Items]
Goodwill (Note 12)				5.1
FOHG [Member]
Business Acquisition [Line Items]
Goodwill (Note 12)														$ 43.9
Deferred tax liability - long-term														0.0
Property, plant and equipment														1.2
Non-controlling interest														8.3
Goodwill (Note 12)														41.7
Inventory														12.4
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest														$ 13.5
Business Acquisition, Percentage of Voting Interests Acquired														62.00%
Treasury Stock Acquired, Average Cost Per Share										$ 0.27
residual growth rate								3.00%
effective income tax rate assumption								39.30%
Fair Value Inputs, Discount Rate								16.00%
Off-market Lease, Unfavorable														$ 0.0
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross														0.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net														$ 21.8
FOHG [Member] | Minimum [Member]
Business Acquisition [Line Items]
Royalty rate								0.25%
FOHG [Member] | Maximum
Business Acquisition [Line Items]
Royalty rate								8.00%
FOH [Member]
Business Acquisition [Line Items]
Percentage Of Beneficial Ownership										88.60%
Compass Production Partners [Member]
Business Acquisition [Line Items]
Property, plant and equipment			$ 811.1
Business Acquisition Percentage Of Equity Interests Acquired			99.80%										25.50%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain			$ 141.2
Proved Developed and Undeveloped Oil and Natural Gas Properties, Period Increase (Decrease)			145.4
Non-controlling interest			0.8
Inventory			1.4
Payments to Acquire Businesses, Gross									$ 118.8
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest			465.7
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			466.5
Salix Animal Health LLC [Member]
Business Acquisition [Line Items]
Goodwill (Note 12)	$ 71.5
Property, plant and equipment	1.2
Business Combination, Consideration Transferred, Liabilities Incurred									1.5
Goodwill (Note 12)	55.5
Inventory	17.0
Business Combination, Consideration Transferred									148.3
Payments to Acquire Businesses, Gross									$ 146.8
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	148.3
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 24.7
Salix Animal Health LLC [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Retention Rate	92.50%
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years
Estimated Income tax rate	38.00%
Goodwill (Note 12)	$ 35.4
Salix Animal Health LLC [Member] | Customer Relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	0.00%
Business Acquisition Contingent Consideration Key Assumptions Discount Rate	12.00%
Salix Animal Health LLC [Member] | Customer Relationships [Member] | Maximum
Business Acquisition [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	12.10%
Business Acquisition Contingent Consideration Key Assumptions Discount Rate	13.00%
Salix Animal Health LLC [Member] | Tradenames Trademarks And Patents [Member]
Business Acquisition [Line Items]
Goodwill (Note 12)	$ 17.0
European IAMS and Eukanuba [Member]
Business Acquisition [Line Items]
Goodwill (Note 12)		$ 4.0				$ 4.0
Property, plant and equipment		58.3				58.3
Goodwill (Note 12)		39.6				39.6
Inventory		16.3				16.3
Business Combination, Consideration Transferred						115.7
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		$ 115.7				115.7
European IAMS and Eukanuba [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									14 years
Estimated Income tax rate		25.00%
Goodwill (Note 12)		$ 10.5				$ 10.5
Business Acquisition Contingent Consideration Key Assumptions Discount Rate		13.00%
European IAMS and Eukanuba [Member] | Customer Relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate		0.00%
Retention Rate		90.00%				90.00%
European IAMS and Eukanuba [Member] | Customer Relationships [Member] | Maximum
Business Acquisition [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate		5.60%
Retention Rate		100.00%				100.00%
Business Acquisition Contingent Consideration Key Assumptions Discount Rate		16.00%
European IAMS and Eukanuba [Member] | Tradenames Trademarks And Patents [Member]
Business Acquisition [Line Items]
Goodwill (Note 12)		$ 25.5				$ 25.5
Tell Manufacturing [Member]
Business Acquisition [Line Items]
Goodwill (Note 12)				7.1
Property, plant and equipment				12.5
Goodwill (Note 12)				12.5
Inventory				7.2
Business combination, assets acquired				30.3
Business Combination, Consideration Transferred						$ 30.3
Business Acquisition, Goodwill, Expected Tax Deductible Amount				$ 7.1
Tell Manufacturing [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Retention Rate				90.00%
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life						13 years
Estimated Income tax rate				38.00%
Goodwill (Note 12)				$ 8.5
Business Acquisition Contingent Consideration Key Assumptions Discount Rate							20.00%
Tell Manufacturing [Member] | Customer Relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate				2.50%
Tell Manufacturing [Member] | Customer Relationships [Member] | Maximum
Business Acquisition [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate				7.10%
Tell Manufacturing [Member] | Tradenames Trademarks And Patents [Member]
Business Acquisition [Line Items]
Goodwill (Note 12)				$ 4.0
Ability Re [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Other						$ (1.5)
Business Combination, Consideration Transferred, Liabilities Incurred						2.8
Business Combination, Consideration Transferred						19.2
Payments to Acquire Businesses, Gross						$ 17.9
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			$ 19.2
Interest Expense [Member] | AAG Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Net Income (Loss)									$ 35.7
Acquisition-related Costs [Member] | AAG Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Net Income (Loss)									47.3
Fair Value Adjustment to Inventory [Member] | AAG Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Net Income (Loss)									$ 18.8
Share-based compensation [Member] | AAG Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block]									10.4
Cost Approach Valuation Technique [Member] | Salix Animal Health LLC [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment, Measurement Basis, Percentage of Total	98.00%
Cost Approach Valuation Technique [Member] | Tell Manufacturing [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment, Measurement Basis, Percentage of Total				97.00%
Market Approach Valuation Technique [Member] | Salix Animal Health LLC [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment, Measurement Basis, Percentage of Total	2.00%
Market Approach Valuation Technique [Member] | Tell Manufacturing [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment, Measurement Basis, Percentage of Total				3.00%

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