Inventories - Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Inventory [Line Items]
Excess of FIFO over LIFO cost	$ (48.0)	$ (47.7)
Total LIFO inventories	71.2	65.5
Total FIFO inventories	118.5	110.4
Total inventories	189.7	175.9
Inventories carried at LIFO:
Inventory [Line Items]
Finished goods	81.8	74.7
Raw materials and work-in-process	37.4	38.5
Inventories carried at FIFO:
Inventory [Line Items]
Finished goods	59.0	52.8
Raw materials and work-in-process	$ 59.5	$ 57.6