Fair value measurements and financial instruments (Tables)

6 Months Ended

Jun. 30, 2024

Fair value measurements and financial instruments

Financial Instruments not Carried at Fair Value

	December 31, 2023				June 30, 2024
	Carrying		Fair		Carrying		Fair
	amount		value		amount		value
	(In millions)
Cash, cash equivalents and restricted cash equivalents	$	462.0	$	462.0	$	427.3	$	427.3
Long-term debt:
Kronos fixed rate 9.50% Senior Secured Notes due 2029		—		—		289.8		321.1
Kronos fixed rate 3.75% Senior Secured Notes due 2025		440.9		424.5		80.2		79.3
LandWell bank note payable		12.2		12.2		11.9		11.9