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Long-Term Debt (Interest Rates And Due Dates) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Finance leases | $ 4,200,000 | $ 3,700,000
Unamortized discounts and deferred loan costs | (15,600,000) | (17,700,000)
Total debt | 2,083,600,000 | 2,090,300,000
Less: current maturities | 9,400,000 | 300,600,000
Total long-term debt | $ 2,074,200,000 | 1,789,700,000
Long-term debt, term | 180 days |
Maximum borrowing capacity | $ 1,200,000,000 | 1,200,000,000
Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity |  | $ 1,200,000,000
Senior Notes |  |
Debt Instrument [Line Items] |  |
Redemption price, percent | 100.00% |
Long-term debt, term | 90 days |
Redemption price, if change of control repurchase event occurs, percent | 101.00% |
Limitation on secured debt, percent | 15.00% |
Industrial development bonds, principally variable interest rates |  |
Debt Instrument [Line Items] |  |
Year-end Interest Rate | 3.90% | 0.30%
Short term and long term debt | $ 3,800,000 | $ 3,800,000
Commercial paper |  |
Debt Instrument [Line Items] |  |
Year-end Interest Rate | 4.80% | 0.00%
Short term and long term debt | $ 282,500,000 | $ 0
Other, partially secured |  |
Debt Instrument [Line Items] |  |
Short term and long term debt | $ 8,700,000 | $ 500,000
Net commercial paper |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 3.20% | 0.20%
Line of Credit | Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 1,200,000,000 |
Senior Notes, Due 2022 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Year-end Interest Rate |  | 3.40%
Short term and long term debt | $ 0 | $ 300,000,000.0
Senior Notes, Due 2024 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Year-end Interest Rate | 3.80% | 3.80%
Short term and long term debt | $ 300,000,000.0 | $ 300,000,000.0
Senior Notes, Due 2027 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Year-end Interest Rate | 3.50% | 3.50%
Short term and long term debt | $ 500,000,000.0 | $ 500,000,000.0
Senior Notes, Due 2029 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Year-end Interest Rate | 4.40% | 4.40%
Short term and long term debt | $ 500,000,000.0 | $ 500,000,000.0
Senior Notes, Due 2051 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Year-end Interest Rate | 3.50% | 3.50%
Short term and long term debt | $ 500,000,000.0 | $ 500,000,000.0

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