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Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 27, 2025	Feb. 13, 2025	Dec. 31, 2024	Apr. 28, 2022	Feb. 24, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts Receivable, after Allowance for Credit Loss, Related Party [Extensible Enumeration]	Other Affiliates [Member]			Other Affiliates [Member]				Other Affiliates [Member]
Revenue, Related Party [Extensible Enumeration]	Other Affiliates [Member]
Share-based Payment Arrangement, Expense	$ 6.3		$ 5.9	$ 16.5	$ 11.0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	11.3		7.8	12.1	8.8
Earnings from continuing operations	7.8		4.8	7.4	3.8
Payments for Repurchase of Common Stock				35.0	25.0
Investment Interest Rate						13.00%
Revenues	145.9		135.2	278.1	268.5
Transition services credit	6.5
Sublease Income				1.2
Sublease, Operating Lease, Right-of-Use Asset	5.3			5.3				$ 0.3
Receivables, Fair Value Disclosure	5.9			5.9				6.4
Accounts Receivable, Allowance for Credit Loss, Current	6.4			6.4
Noncash Investing and Financing Items
Purchases of property and equipment included in accounts payable				1.3	1.0
Share Repurchase Program, Authorized, Amount										$ 100.0
Share Repurchase Program, Authorized Amount, Increase (Decrease)							$ 150.0		$ 150.0
Payments for Repurchase of Common Stock				(35.0)	(25.0)
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability				14.6	0.6
Payment to Finance CMM Sale Seller Loan		$ 6.4
Seller Cash Balance Requirement		40.0
Investment Interest Rate						13.00%
Receivables, Fair Value Disclosure	5.9			5.9				6.4
Accrued Separation Costs	8.7			8.7				13.5
Share Repurchase Program, Remaining Authorized, Amount	159.0			159.0
Share-based Payment Arrangement, Expense	6.3		5.9	16.5	11.0
Earnings from continuing operations	7.8		4.8	7.4	3.8
Operating Segments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues	145.9		$ 135.2	278.1	$ 268.5
Transition services credit	$ (0.5)			$ (1.2)
Treasury Stock, Common
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Stock Repurchased During Period, Shares	1,881,694		1,432,989	2,182,462	1,432,989
Noncash Investing and Financing Items
Stock Repurchased During Period, Shares	(1,881,694)		(1,432,989)	(2,182,462)	(1,432,989)
Revision of Prior Period, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest				$ 1.1
Earnings from continuing operations				1.0
Revenues			$ 1.6		$ 3.5
Noncash Investing and Financing Items
Earnings from continuing operations				$ 1.0
Selling, General and Administrative Expenses [Member] | Revision of Prior Period, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Share-based Payment Arrangement, Expense		0.9
Noncash Investing and Financing Items
Share-based Payment Arrangement, Expense		0.9
Cost of Sales [Member] | Revision of Prior Period, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Share-based Payment Arrangement, Expense		0.1
Noncash Investing and Financing Items
Share-based Payment Arrangement, Expense		0.1
Research and Development Expense | Revision of Prior Period, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Share-based Payment Arrangement, Expense		0.1
Noncash Investing and Financing Items
Share-based Payment Arrangement, Expense		$ 0.1
Related Party [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue, Related Party [Extensible Enumeration]				Other Affiliates [Member]
Accounts and Other Receivables, Net, Current	$ 3.2			$ 3.2				1.8
Revenues	4.0
Noncash Investing and Financing Items
Accounts and Other Receivables, Net, Current	$ 3.2			$ 3.2				$ 1.8

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