Note 11 - Stockholders' Equity - Summary of Accumulated Other Comprehensive Losses (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Foreign currency translation adjustment	$ 123.0	$ (636.9)
Pension and postretirement adjustment, net of tax	(93.6)	(94.3)
Accumulated other comprehensive income (loss)	$ 29.4	$ (731.2)