Long-Term Debt (Interest Rates And Due Dates) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Jul. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Finance leases	$ 3,900,000		$ 3,700,000
Unamortized discounts and deferred loan costs	(10,000,000.0)		(11,700,000)
Total debt	1,497,700,000		1,864,100,000
Less: current maturities	1,500,000		1,300,000
Total long-term debt	$ 1,496,200,000		$ 1,862,800,000
Long-term debt, term	180 days
Senior Notes
Debt Instrument [Line Items]
Redemption price (as a percent)	100.00%
Long-term debt, term	90 days
Redemption price, if change of control repurchase event occurs (as a percent)	101.00%
Limitation on secured debt (as a percent)	15.00%
Industrial development bonds - variable interest rates
Debt Instrument [Line Items]
Year-end Interest Rate	4.60%		5.00%
Short term and long term debt	$ 3,800,000		$ 3,800,000
Commercial paper
Debt Instrument [Line Items]
Year-end Interest Rate	0.00%		5.10%
Short term and long term debt	$ 0		$ 368,000,000.0
Other, partially secured
Debt Instrument [Line Items]
Short term and long term debt	$ 0		$ 300,000
Net commercial paper
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.00%		5.60%
Line of Credit | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,000,000,000	$ 1,200,000,000	$ 1,200,000,000
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