v3.26.1
Debt (Details Textual) - USD ($)
$ in Millions
1 Months Ended
Mar. 20, 2026
Mar. 18, 2025
Apr. 30, 2026
Mar. 31, 2021
Apr. 22, 2026
Mar. 31, 2026
Revolving Credit Facility            
Debt Instrument [Line Items]            
Letters of credit outstanding, amount           $ 27.5
Subsequent Event            
Debt Instrument [Line Items]            
Financing cash flows from finance leases     $ 41.4      
Gain (loss) on termination of lease     $ 0.8      
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Amount available subject to debt covenants           972.5
Senior Notes due 2029            
Debt Instrument [Line Items]            
Debt instrument, face amount       $ 375.0    
Proceeds from debt issuance       $ 367.5    
New Gold 2032 Senior Notes | Unsecured Debt            
Debt Instrument [Line Items]            
Debt instrument, face amount   $ 400.0        
Stated interest rate   6.875%        
Proceeds from issuance of long-term debt   $ 393.7        
Long-term debt outstanding           $ 400.0
Effective interest rate           6.875%
Event of default acceleration, threshold amount           25.00%
New Gold 2032 Senior Notes | Unsecured Debt | Subsequent Event            
Debt Instrument [Line Items]            
Debt instrument, face amount         $ 14.2  
Subsidiary guarantee, threshold amount         20.0  
2032 Senior Notes Indenture | Unsecured Debt | Subsequent Event            
Debt Instrument [Line Items]            
Debt instrument, face amount         $ 385.8  
Stated interest rate         6.875%  
Revolving Credit Facility | Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 1,000.0          
Line of credit, accordion feature, higher borrowing capacity option $ 250.0          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Consolidated Net Leverage Ratio | Minimum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.45%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Consolidated Net Leverage Ratio | Minimum | Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.45%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Consolidated Net Leverage Ratio | Minimum | Daily Simple Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.45%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Consolidated Net Leverage Ratio | Maximum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.50%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Consolidated Net Leverage Ratio | Maximum | Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Basis spread on variable rate 2.50%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Consolidated Net Leverage Ratio | Maximum | Daily Simple Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Basis spread on variable rate 2.50%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Debt Rating | Minimum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.125%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Debt Rating | Minimum | Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.125%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Debt Rating | Minimum | Daily Simple Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.125%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Debt Rating | Maximum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.00%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Debt Rating | Maximum | Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Basis spread on variable rate 2.00%          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Debt Rating | Maximum | Daily Simple Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Basis spread on variable rate 2.00%