Note 9 - Information by Operating Segment - Net Economic Earnings to Net Income (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Net Income	$ 91.0	$ 91.0	$ 55.7	$ 55.7
Fair value and timing adjustments	(7.8)		3.7
Income tax adjustments	1.9		3.2
Net Economic Earnings	$ 85.1		$ 62.6