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Debt (Narrative) (Details) - USD ($)
 6 Months Ended 12 Months Ended
Dec. 20, 2023
Jun. 30, 2024
Dec. 31, 2023
Line of Credit Facility [Line Items]      
Finance lease liabilities   $ 6,700,000 $ 5,300,000
Finance lease liabilities, current   $ 2,500,000 $ 2,500,000
Other accrued expenses and liabilities   Other Liabilities, Current Other Liabilities, Current
Finance lease liabilities, long-term   $ 4,200,000 $ 2,800,000
Other long-term obligations   Other Liabilities, Noncurrent Other Liabilities, Noncurrent
Letters of credit outstanding (in US dollars)   $ 75,000,000 $ 116,700,000
Interest rate description   At the Company’s election, borrowings under the 2023 Revolving Credit Facility bear interest at either: (1) a base rate plus a margin of 0.125% to 0.875%, depending on the Company’s Leverage Ratio (as such term is defined in the 2023 Credit Agreement), or (2) a rate equal to the secured overnight financing rate as administered by the Federal Reserve Bank of New York for the applicable tenor plus 0.10% (“Adjusted Term SOFR”) plus a margin of 1.125% to 1.875%, depending on the Company’s Leverage Ratio. The base rate is determined by the greater of: (a) the prime commercial lending rate announced by Bank of Montreal from time to time, (b) the federal funds effective rate, plus 1/2 of 1.00%, (c) Adjusted Term SOFR for a one-month tenor, plus 1.00%, or (d) 0.00%.  
2023 Credit Agreement      
Line of Credit Facility [Line Items]      
Credit agreement, initiation date Dec. 20, 2023    
Expiration date of credit agreement   Dec. 20, 2028  
Base Rate | Minimum [Member] | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   0.125%  
Base Rate | Maximum [Member] | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   0.875%  
Adjusted Term SOFR | Minimum [Member] | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   1.125%  
Adjusted Term SOFR | Maximum [Member] | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   1.875%  
Credit Agreement Base Rate, Federal Funds Rate | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   0.50%  
Credit Agreement Base Rate, Adjusted Term SOFR One Month Tenor Rate | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   1.00%  
Credit Agreement, 0% Base Rate | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   0.00%  
Secured Overnight Financing Rate (SOFR) | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   0.10%  
Revolving Credit Facility [Member] | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Line of credit facility maximum borrowing capacity (in US dollars) $ 1,300,000,000    
Increase in borrowing capacity (in US dollars)   $ 900,000,000  
Letters of credit maximum borrowing capacity (in US dollars)   600,000,000  
Borrowings under revolving credit facility (in US dollars)   $ 0 $ 0
Commitment fee percentage of unused amount   0.125% 0.125%
Revolving Credit Facility [Member] | Minimum [Member] | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Commitment fee percentage of unused amount   0.125%  
Letter of credit fees   0.85%  
Revolving Credit Facility [Member] | Maximum [Member] | 2023 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Commitment fee percentage of unused amount   0.25%  
Letter of credit fees   1.875%