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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, 2015
Sep. 30, 2014
Oct. 31, 2014
Oct. 06, 2014
May. 30, 2014
Jan. 02, 2014
Sep. 30, 2013
Mar. 05, 2013
Feb. 14, 2013
Business Acquisition [Line Items]                          
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value           $ 12.0              
Payments to Acquire Businesses, Gross           $ 1.5              
Estimated Income tax rate         35.00% 35.00%              
Oil and natural gas properties                          
Goodwill (Note 12)         $ 2,487.4 $ 1,524.8         $ 1,476.7    
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination           13.5              
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, Consideration Transferred, Other           $ 1.5              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables                   1.1      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest                   35.8      
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]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents             $ 30.1            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value         346.9                
Payments to Acquire Businesses, Gross         118.8                
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                          
Inventory             1.4            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt             (327.0)            
Non-controlling interests             $ (0.8)            
Oil and natural gas properties                          
Business Acquisition Percentage Of Equity Interests Acquired             99.80% 25.50%          
Property, plant and equipment             $ 811.1            
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination         465.7                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables             17.8            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other             (36.9)            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest             465.7            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets             12.3            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable             42.3            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net             466.5            
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             8.4            
Payments to Acquire Businesses, Gross       $ 17.9                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                          
Total assets acquired             0.1            
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                        
FOHG [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents                 $ 0.8        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                          
Inventory                 12.4        
Deferred tax liability - long-term                 0.0        
Non-controlling interests                 (8.3)        
Goodwill (Note 12)                 41.7        
Oil and natural gas properties                          
Property, plant and equipment                 1.2        
Goodwill (Note 12)                 43.9        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables                 0.7        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest                 13.5        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets                 2.8        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable                 81.7        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net                 $ 21.8        
Compass | EXCO [Member]                          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                          
Non-controlling interests                         $ (119.1)
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%                
Preliminary working capital and other adjustments                         $ 30.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                         $ 694.5
Cotton-Valley Oil and Gas Properties | HGI                          
Oil and natural gas properties                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                       $ 130.7  
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) $ 1.0                        
Oil and natural gas properties                          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years                        
Licensing Agreements [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                        
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         14 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