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Mergers and Acquisitions (Schedule of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Nov. 04, 2024	Dec. 31, 2023
Assets
Goodwill	$ 357.6		$ 359.8
RIS Acquisition
Assets
Cash and cash equivalents		$ 4.5
Accounts receivable		1.1
Property, plant and equipment		3.3
Goodwill		5.0
Other assets		0.1
Total assets		14.0
Liabilities
Accounts payable		0.6
Other accrued liabilities		2.0
Deferred income taxes		0.4
Total liabilities		3.0
Fair value of net assets acquired		$ 11.0