Discontinued Operations - Assets and Liabilities from Discontinued Operations (Details) - Disposed of by held for sale - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Accounts receivable, less allowances	$ 17.6
Inventories, net	40.0
Unbilled contract revenue	3.8
Prepaid expenses	0.3
Property, plant, and equipment, net	35.0
Goodwill	102.2
Identifiable intangible assets, net	108.5
Total assets of discontinued operations	307.4	$ 0.0
Accounts payable	15.6
Customer advances and billings in excess of contract revenue	9.5
Accrued salaries, wages, and benefits	1.5
Current portion of warranty reserve	0.8
Short-term debt and current portion of long-term debt	0.2
Operating lease liabilities, current	0.3
Other current liabilities	0.3
Operating lease liabilities, non-current	1.8
Total liabilities of discontinued operations	$ 30.0