Acquisitions and Dispositions of Businesses (Acquisitions) (Narrative) (Details) $ in Millions	1 Months Ended			12 Months Ended
	Mar. 31, 2026 business	Oct. 31, 2025 USD ($) business	Jun. 30, 2025 business	Dec. 31, 2025 USD ($) business	Jul. 31, 2025
Business Combination [Line Items]
Number of businesses acquired				5
Acquisition purchase price | $				$ 71.2
Net pension obligations | $				107.5
Goodwill expected to be deductible for income tax purposes | $				$ 12.4
Graham Healthcare Group [Member] | Other Healthcare Businesses [Member]
Business Combination [Line Items]
Number of businesses acquired	1	2		2
Education [Member]
Business Combination [Line Items]
Number of businesses acquired				1
Education [Member] | Supplemental Education [Member]
Business Combination [Line Items]
Number of businesses acquired			1
Manufacturing [Member]
Business Combination [Line Items]
Number of businesses acquired				1
Automotive [Member]
Business Combination [Line Items]
Number of businesses acquired				1
Arconic Architectural Products, LLC [Member] | Manufacturing [Member] | Hoover Treated Wood Products [Member]
Business Combination [Line Items]
Percentage of interest acquired					100.00%
Honda auto dealership [Member] | Automotive [Member]
Business Combination [Line Items]
Floor plan payables | $		$ 4.9
Honda auto dealership [Member] | Delayed Draw Term Loan [Member] | Automotive [Member]
Business Combination [Line Items]
Amount borrowed to finance business acquisition | $		$ 38.7