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Debt (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 20, 2023 | Mar. 31, 2024 | Dec. 31, 2023
Line of Credit Facility [Line Items] |  |  |
Finance lease liabilities |  | $ 5,300,000 | $ 5,300,000
Finance lease liabilities, current |  | 2,400,000 | 2,500,000
Finance lease liabilities, long-term |  | $ 2,900,000 | $ 2,800,000
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] |  | Other Liabilities, Current | Other Liabilities, Current
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Letters of credit outstanding (in US dollars) |  | $ 89,900,000 | $ 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% |
SOFR | 2023 Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate |  | 0.10% |
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% |
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% |

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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481573/470-10-45-13 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481573/470-10-45-14 + Details
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