Note 5 - Leases - Lease Cost and Other Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating lease cost	[1]	$ 8.2	$ 11.6	$ 25.6	$ 36.8
Sublease income		(0.3)	(0.5)	(1.0)	(1.6)
Depreciation of finance lease assets	[2]	3.8	3.1	10.6	9.6
Interest on finance lease liabilities	[3]	0.4	0.0	0.7	0.4
Total lease cost		12.1	14.2	35.9	45.2
Operating cash outflows from operating leases		(8.2)	(12.7)	(25.9)	(37.9)
Operating cash outflows from finance leases		(0.4)	0.0	(0.7)	(0.4)
Financing cash outflows from finance leases		$ (10.4)	$ (11.7)	$ (13.2)	$ (13.5)

[1] Included in "Cost of revenues" and "Selling, general and administrative" expenses in our accompanying condensed consolidated statements of operations

[2] Included in "Depreciation and amortization of fixed assets" in our accompanying condensed consolidated statements of operations

[3] Included in "Interest expense" in our accompanying condensed consolidated statements of operations