Note 7 - Dispositions and Discontinued Operations - Divestitures and Business Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating loss	$ 0.0	$ 0.0	$ 0.0	$ (139.8)
Investment loss and others, net	0.0	0.0	0.0	(5.5)
Loss from discontinued operations before income taxes	0.0	0.0	0.0	(145.3)
Income tax expense	0.0	0.0	0.0	(0.2)
Loss from discontinued operations	0.0	0.0	0.0	(145.5)
Energy Business [Member] \| Discontinued Operations, Held-for-Sale [Member]
Revenues	0.0	0.0	0.0	46.8
Cost of revenues (exclusive of items shown separately below)	0.0	0.0	0.0	18.2
Selling, general and administrative	0.0	0.0	0.0	33.1
Depreciation and amortization of fixed assets	0.0	0.0	0.0	0.0
Amortization of intangible assets	0.0	0.0	0.0	0.0
Other operating loss, net	0.0	0.0	0.0	135.3
Total operating expenses	0.0	0.0	0.0	186.6
Depreciation and amortization of fixed assets	0.0	0.0	0.0	0.0
Amortization of intangible assets	0.0	0.0	0.0	0.0
Operating lease right-of-use assets, net	0.0	0.0	0.0	0.1
Capital expenditures	0.0	0.0	0.0	(6.5)
Fixed assets included in accounts payable and accrued liabilities	$ 0.0	$ 0.0	$ 0.0	$ 0.0

Amount of capital expenditure attributable to discontinued operations.

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