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Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 17, 2019
Mar. 20, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Revolving term credit facility          
Size of facility         $ 1,260.0
Balance, beginning of year     $ 210.0    
Drawdowns     435.0 $ 237.0  
Repayments     (565.0) (27.0)  
Balance, end of year     80.0 210.0  
Amount outstanding     80.0 210.0 80.0
Credit Facility          
Revolving term credit facility          
Balance, beginning of year     210.0    
Drawdowns     275.0 210.0  
Repayments     $ (485.0)    
Balance, end of year       210.0  
Maturity period     5 years    
Maximum borrowing capacity         1,000.0
Repayment of credit facility     $ 325.0    
Debt refinanced         $ 160.0
Amount outstanding     $ 210.0 210.0  
Credit Facility | Bottom          
Revolving term credit facility          
Bankers acceptance period under credit facility     30 days    
Stamping fee (as a percent)     1.00%    
Standby fee (as a percent)     0.20%    
Credit Facility | Top          
Revolving term credit facility          
Bankers acceptance period under credit facility     180 days    
Stamping fee (as a percent)     2.05%    
Standby fee (as a percent)     0.41%    
Credit Facility | Marcellus Shale Royalties Pennsylvania          
Revolving term credit facility          
Drawdowns     $ 275.0    
Credit Facility | CIBC | Bottom          
Revolving term credit facility          
Spread on variable rate (as a percent)         0.00%
Credit Facility | CIBC | Top          
Revolving term credit facility          
Spread on variable rate (as a percent)         1.05%
Credit Facility | LIBOR | Bottom          
Revolving term credit facility          
Spread on variable rate (as a percent)         1.00%
Credit Facility | LIBOR | Top          
Revolving term credit facility          
Spread on variable rate (as a percent)         2.05%
Credit Facility | Prime rate | Bottom          
Revolving term credit facility          
Spread on variable rate (as a percent)         0.00%
Credit Facility | Prime rate | Top          
Revolving term credit facility          
Spread on variable rate (as a percent)         1.05%
Term Loan          
Revolving term credit facility          
Drawdowns     160.0    
Repayments     (80.0)    
Balance, end of year     80.0    
Maturity period 1 year        
Amount outstanding     $ 80.0   $ 80.0
Borrowed amount $ 160.0       160.0
Term Loan | 30-day Libor          
Revolving term credit facility          
Spread on variable rate (as a percent) 0.85%        
FNBC Credit Facility          
Revolving term credit facility          
Drawdowns       27.0  
Repayments       $ (27.0)  
Maturity period   1 year      
Maximum borrowing capacity   $ 100.0     $ 100.0
Standby fee (as a percent)     0.27%    
FNBC Credit Facility | CIBC          
Revolving term credit facility          
Spread on variable rate (as a percent)         0.35%
FNBC Credit Facility | LIBOR          
Revolving term credit facility          
Spread on variable rate (as a percent)         1.35%