Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of senior unsecured notes	$ 3,500,000	$ 3,100,000
Fair value of senior unsecured notes	3,500,000	3,200,000
Principal	4,014,590	$ 3,823,215
5.875% Alkali senior secured notes due 2042(2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal	$ 400,000