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Acquisitions (Details Textual)
$ in Millions
 1 Months Ended 6 Months Ended
Aug. 31, 2021
USD ($)
a
Jun. 30, 2021
USD ($)
a
Jun. 30, 2022
USD ($)
a
Aug. 31, 2021
USD ($)
a
Jun. 30, 2021
USD ($)
a
Jun. 30, 2021
USD ($)
a
Oct. 31, 2020
Rock Ridge Royalty, LLC [Member]              
Business Acquisition [Line Items]              
Net royalty acres | a   18,700     18,700 18,700  
Total consideration         $ 258.6    
Transaction costs capitalized         $ 1.1    
Rock Ridge Royalty, LLC [Member] | Unproved Oil And Gas Property [Member]              
Business Acquisition [Line Items]              
Total consideration   $ 190.3          
Rock Ridge Royalty, LLC [Member] | Proved Oil And Gas Property [Member]              
Business Acquisition [Line Items]              
Total consideration   $ 68.3          
Foundation Minerals, LLC [Member]              
Business Acquisition [Line Items]              
Net royalty acres | a     19,700        
Total consideration     $ 320.6        
Customary closing adjustments     2.1        
Transaction costs capitalized     0.6        
Foundation Minerals, LLC [Member] | Unproved Oil And Gas Property [Member]              
Business Acquisition [Line Items]              
Total consideration     189.3        
Foundation Minerals, LLC [Member] | Proved Oil And Gas Property [Member]              
Business Acquisition [Line Items]              
Total consideration     $ 131.3        
Falcon Acquisition [Member]              
Business Acquisition [Line Items]              
Net royalty acres | a     34,000        
Source Acquisition [Member]              
Business Acquisition [Line Items]              
Net royalty acres | a 25,000     25,000      
Total consideration       $ 252.9      
Transaction costs capitalized       $ 3.5      
Source Acquisition [Member] | Unproved Oil And Gas Property [Member]              
Business Acquisition [Line Items]              
Total consideration $ 183.2            
Source Acquisition [Member] | Proved Oil And Gas Property [Member]              
Business Acquisition [Line Items]              
Total consideration $ 69.7            
Chambers Minerals, LLC [Member]              
Business Acquisition [Line Items]              
Acquisition percentage   84.00%     84.00% 84.00% 84.00%
Business acquisition net book value from sale of assets   $ 60.6     $ 60.6    
Excess of fair value of properties above net book value   37.5       $ 37.5  
Chambers Minerals, LLC [Member] | Unproved Oil And Gas Property [Member]              
Business Acquisition [Line Items]              
Business acquisition net book value from sale of assets   45.3          
Chambers Minerals, LLC [Member] | Proved Oil And Gas Property [Member]              
Business Acquisition [Line Items]              
Business acquisition net book value from sale of assets   $ 15.3       $ 15.3  
Chambers Minerals, LLC [Member] | Kimmeridge [Member]              
Business Acquisition [Line Items]              
Royalty interest ownership percentage             2.00%