Inventories - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Inventories
Inventory method			last-in, first-out (“LIFO”)
Effect of LIFO inventory liquidation on income		$ 7.5		$ 7.5
Replacement costs over stated LIFO value	$ 48.3		$ 48.3		$ 67.8
Lower of cost or market inventory adjustment	$ 9.4	$ 12.0	$ 8.9	$ 1.9