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Summary of significant accounting policies (Details) - USD ($)
Dec. 01, 2024
Apr. 29, 2024
Feb. 29, 2024
May 15, 2023
Mar. 31, 2024
Feb. 28, 2024
Dec. 31, 2023
Mar. 31, 2023
Aug. 07, 2020
Debt Instrument [Line Items]                  
Total debt         $ 909,200,000   $ 868,400,000    
Cash and cash equivalents         78,500,000   111,700,000 $ 430,200,000  
Line of Credit                  
Debt Instrument [Line Items]                  
Total debt         264,200,000   219,200,000    
Senior Unsecured Notes Due August 2028 | Senior Notes                  
Debt Instrument [Line Items]                  
Total debt         $ 450,000,000.0   450,000,000.0   $ 450,000,000
Stated percentage         3.875%       3.875%
Revolving Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Total debt         $ 194,200,000   $ 198,200,000    
Revolving Credit Facility | Amended Credit Agreement | Line of Credit                  
Debt Instrument [Line Items]                  
Debt instrument, mandatory prepayment threshold           $ 125,000,000      
Revolving Credit Facility | Seventh Amendment | Line of Credit | Forecast                  
Debt Instrument [Line Items]                  
Debt instrument, amendment fee, percent 1.00%                
Revolving Credit Facility | Seventh Amendment | Subsequent Event | Line of Credit                  
Debt Instrument [Line Items]                  
Debt instrument, covenant, consideration threshold   $ 85,000,000              
Debt instrument, mandatory prepayment, percentage of net cash proceeds   100.00%              
Debt instrument, mandatory prepayment threshold   $ 85,000,000              
Debt instrument, amendment fee, percent   0.50%              
Revolving Credit Facility | Seventh Amendment | Subsequent Event | Line of Credit | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate   7.00%              
Revolving Credit Facility | Seventh Amendment | Subsequent Event | Line of Credit | SOFR, RFR And Eurocurrency                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate   8.50%              
Revolving Credit Facility | Seventh Amendment - Through July 30, 2024 | Subsequent Event | Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity   $ 270,000,000              
Revolving Credit Facility | Seventh Amendment - From July 31, 2024 Through October 30, 2024 | Subsequent Event | Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity   225,000,000              
Revolving Credit Facility | Seventh Amendment - On October 31, 2024 And Thereafter | Subsequent Event | Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity   $ 200,000,000              
Revolving Credit Facility | Forbearance Agreement And Amendment | Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity     $ 270,000,000            
Debt instrument, mandatory prepayment threshold     $ 100,000,000            
Revolving Credit Facility | Forbearance Agreement And Amendment | Line of Credit | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate     5.00%            
Revolving Credit Facility | Forbearance Agreement And Amendment | Line of Credit | SOFR, RFR And Eurocurrency                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate     6.50%            
Term Loan Facility | Amended Credit Agreement                  
Debt Instrument [Line Items]                  
Outstanding credit facility         $ 458,400,000        
Debt instrument, covenant, consideration threshold       $ 75,000,000