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Summary of significant accounting policies (Details) - USD ($)
Dec. 01, 2024
Apr. 29, 2024
Mar. 31, 2024
Feb. 29, 2024
Jun. 30, 2024
Feb. 28, 2024
Dec. 31, 2023
Jun. 30, 2023
Aug. 07, 2020
Debt Instrument [Line Items]                  
Total debt         $ 863,800,000   $ 868,400,000    
Cash and cash equivalents         69,700,000   111,700,000 $ 88,600,000  
Line of Credit                  
Debt Instrument [Line Items]                  
Total debt         222,700,000   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%   3.875%
Revolving Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Total debt         $ 190,300,000   $ 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                  
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 | Line of Credit | Forecast                  
Debt Instrument [Line Items]                  
Debt instrument, amendment fee, percent 1.00%                
Revolving Credit Facility | Seventh Amendment | Line of Credit | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate   7.00%              
Revolving Credit Facility | Seventh Amendment | 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 | Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity   $ 240,000,000              
Revolving Credit Facility | Seventh Amendment - From July 31, 2024 Through September 29, 2024 | Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity   210,000,000              
Revolving Credit Facility | Seventh Amendment - From September 30, 2024 Through October 30, 2024 | Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity   205,000,000              
Revolving Credit Facility | Seventh Amendment - From October 31, 2024 Through November 29, 2024 | Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity   180,000,000              
Revolving Credit Facility | Seventh Amendment - On November 30, 2024 And Thereafter | Line of Credit                  
Debt Instrument [Line Items]                  
Current borrowing capacity   $ 170,000,000              
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]                  
Debt instrument, covenant, consideration threshold     $ 75,000,000