Note 13 - Income Taxes - Summary of Deferred Tax Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Employee wages and other benefits	$ 54.9	$ 46.7
Deferred rent	9.2	9.6
Net operating loss carryover	12.0	11.7
Capital and other unrealized losses	1.6	1.5
Interest expense	31.1	34.7
Book/tax energy basis difference	112.2	0.0
Other	15.2	5.2
Total	236.2	109.4
Less valuation allowance	(45.3)	(38.3)
Deferred tax assets	190.9	71.1
Fixed assets and intangible assets	(223.9)	(280.6)
Commissions	(16.8)	(16.1)
Pensions	(56.5)	(54.2)
Other	(7.6)	(8.7)
Deferred tax liabilities	(304.8)	(359.6)
Deferred tax liabilities, net	$ (113.9)	$ (288.5)