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Long-Term Debt (Narrative) (Details) - USD ($)
Jul. 01, 2021
Jan. 29, 2021
Sep. 30, 2023
Dec. 31, 2022
Sep. 13, 2019
Apr. 25, 2017
Debt Instrument [Line Items]            
Outstanding letters of credit     $ 10,200,000      
Line of Credit | Term Loan            
Debt Instrument [Line Items]            
Senior notes, principal amount   $ 400,000,000        
Quarterly amortization payment   1.00%        
Line of Credit | Term Loan | Federal Funds Rate            
Debt Instrument [Line Items]            
Spread over variable rate   0.50%        
Line of Credit | Term Loan | One Month Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Spread over variable rate   1.00%        
Line of Credit | Term Loan | Adjusted SOFR Rate            
Debt Instrument [Line Items]            
Spread over variable rate   1.75%        
Line of Credit | Term Loan | Alternate Base Rate            
Debt Instrument [Line Items]            
Spread over variable rate   0.75%        
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity   $ 350,000,000        
Outstanding balance     391,000,000 $ 394,000,000    
Principal payment period $ 1,000,000          
Outstanding under facility     $ 0      
Total leverage ratio   5.0        
Temporary increase to leverage ratio   5.5        
Secured net leverage ratio financial maintenance covenants   3.75        
Temporary increase to secured net leverage ratio financial maintenance covenants   4.25        
Leverage ratio   3.0        
Actual total leverage ratio     1.75      
Maximum restricted payments in cash   $ 116,100,000        
Maximum consolidated net tangible assets over the life of the credit agreement   4.50%        
Line of Credit | Revolving Credit Facility | One Month Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Spread over variable rate   1.00%        
Line of Credit | Revolving Credit Facility | Adjusted SOFR Rate            
Debt Instrument [Line Items]            
Spread over variable rate   0.10%        
Line of Credit | Revolving Credit Facility | Adjusted SOFR Rate | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate   1.75%        
Line of Credit | Revolving Credit Facility | Adjusted SOFR Rate | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate   2.25%        
Line of Credit | Revolving Credit Facility | Alternate Base Rate | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate   0.75%        
Line of Credit | Revolving Credit Facility | Alternate Base Rate | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate   1.25%        
Line of Credit | Revolving Credit Facility | Floor Rate            
Debt Instrument [Line Items]            
Spread over variable rate   0.00%        
Line of Credit | Letters of credit            
Debt Instrument [Line Items]            
Outstanding letters of credit     $ 6,200,000      
5.625% senior notes due 2027 (net of unamortized discount of $1.3 at September 30, 2023 and $1.6 at December 31, 2022) | Senior Notes            
Debt Instrument [Line Items]            
Senior notes, principal amount           $ 300,000,000
Interest rate     5.625%     5.625%
4.75% senior notes due 2029 (net of unamortized discount of $3.7 at September 30, 2023 and $4.2 at December 31, 2022) | Senior Notes            
Debt Instrument [Line Items]            
Senior notes, principal amount         $ 500,000,000  
Interest rate     4.75%   4.75%  
3.75% senior notes due 2031 (net of unamortized discount of $4.6 at September 30, 2023 and $5.1 at December 31, 2022) | Senior Notes            
Debt Instrument [Line Items]            
Senior notes, principal amount   $ 500,000,000        
Interest rate   3.75% 3.75%