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Acquisitions and other transactions (Details)
$ in Millions
 3 Months Ended 8 Months Ended 9 Months Ended
Oct. 19, 2018
USD ($)
Feb. 28, 2018
AUD ($)
item
Jan. 19, 2018
USD ($)
$ / oz
item
oz
Sep. 30, 2018
USD ($)
Oct. 23, 2018
USD ($)
Y
Sep. 30, 2018
USD ($)
Feb. 20, 2018
USD ($)
Dec. 31, 2017
USD ($)
SCOOP and STACK, Oklahoma | Asset acquisition subsequent to year-end                
Acquisitions                
Value of contribution to be made by entity         $ 218.5      
Value of royalties generated by the acquired assets         3.7      
net value of contribution to be made by entity         $ 214.8      
The number of years of annual spending amounts | Y         3      
The number of years of annual spending amounts for Continental Resources, Inc. | Y         3      
SCOOP and STACK, Oklahoma | Asset acquisition subsequent to year-end | Bottom                
Acquisitions                
Amount of expected contribution to be made in remainder of 2018         $ 35.0      
SCOOP and STACK, Oklahoma | Asset acquisition subsequent to year-end | Top                
Acquisitions                
Value of annual spending amount         300.0      
Value of contribution to be made by Continental Resources, Inc.         75.0      
Amount of expected contribution to be made in remainder of 2018         $ 55.0      
Amended and restated Cobre Panama Agreement                
Acquisitions                
Percentage of the project covered by the amended and restated agreement (as a percent)     100.00%          
Ownership percentage of the project by First Quantum (as a percent)     90.00%          
Ownership percentage of project by KORES (as a percent)     10.00%          
Number of distinct precious metals streams | item     2          
Capitalized costs for the project           $ 1,337.8    
Amended and restated Cobre Panama Agreement - Fixed Payment Stream                
Acquisitions                
First Quantum's initial interest percent in original stream (as a percent)     80.00%          
Payment for each ounce of gold (in dollars per ounce) | $ / oz     418          
Payment for each ounce of silver (in dollars per ounce) | $ / oz     6.27          
The annual inflation factor rate (as a percent)     1.50%          
Quantity of delivered gold ounces before purchase decreases to next threshold from initial threshold | oz     1,341,000          
Maximum ounces of silver on which on-going price of spot price is payable | oz     21,500,000          
Percentage of spot price of gold on which on-going price is paid after maximum ounces have been delivered     50.00%          
Percentage of spot price of silver on which on-going price is paid after maximum ounces have been delivered     50.00%          
Deposit funded on a pro-rata basis     33.33%          
Amount funded by the company       $ 88.4   247.8    
Cumulative amount funded by the company       $ 974.4   $ 974.4    
Amended and restated Cobre Panama Agreement - Fixed Payment Stream | Top                
Acquisitions                
Deposit provided to acquiree     $ 1,000.0          
Amended and restated Cobre Panama Agreement - Fixed Payment Stream | Asset acquisition subsequent to year-end                
Acquisitions                
Amount funded by the company $ 25.6              
Cumulative amount funded by the company 1,000.0              
Amended and restated Cobre Panama Agreement - Fixed Payment Stream | Asset acquisition subsequent to year-end | Top                
Acquisitions                
Deposit provided to acquiree $ 1.0              
Amended and restated Cobre Panama Agreement - Floating Payment Stream                
Acquisitions                
First Quantum additional interest percent in project acquired from LS-Nikko Copper Inc. (as a percent)     10.00%          
KORES interest percent in project (as a percent)     10.00%          
Percentage of spot price of gold and silver on which on-going price is paid     20.00%          
Maximum ounces of gold on which on-going price of spot price is payable | oz     604,000          
Maximum ounces of silver on which on-going price of spot price is payable | oz     9,618,000          
Percentage of spot price of gold and silver on which on-going price is paid after maximum ounces have been delivered     50.00%          
Amount funded by the company     $ 356.0          
Bowen Basin Coal Royalties, Australia                
Acquisitions                
Number of additional exploration tenements | item   33            
Cash transferred   $ 4,200,000            
Royalty rate per tonne   $ 0.10            
U.S. Oil & Gas Royalties - Delaware Texas                
Acquisitions                
Consideration transferred             $ 101.3  
Deposit provided to acquiree               $ 11.0