Note 6 - Inventories - Inventories (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Excess of FIFO over LIFO cost(a)	[1]	$ (31.4)	$ (33.4)
Total LIFO inventories		32.6	50.0
Total FIFO inventories		95.1	100.1
Total inventories		127.7	150.1
LIFO Inventory [Member]
Finished goods		42.4	50.9
Raw materials, production parts and work-in-process		21.6	32.5
FIFO Inventory [Member]
Finished goods		55.0	60.1
Raw materials, production parts and work-in-process		$ 40.1	$ 40.0

[1] Inventories of $32.6 million as of December 31, 2020, and $50.0 million as of December 31, 2019, were valued at LIFO. The difference between replacement cost and the stated LIFO inventory value is not materially different from the reserve for the LIFO valuation method.