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Leases (Assets and Liabilities Balance Related to Finance and Operating Leases) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Leases [Abstract]    
Finance lease right-of-use assets $ 1.4 $ 1.5
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, plant and equipment, net of accumulated depreciation of $403.7 and $385.7 Property, plant and equipment, net of accumulated depreciation of $403.7 and $385.7
Operating lease right-of-use assets $ 25.4 $ 18.9
Finance lease obligations, current portion $ 0.4 $ 0.4
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other accrued liabilities Other accrued liabilities
Finance lease obligations, non-current portion $ 1.0 $ 1.1
Total finance lease obligations 1.4 1.5
Operating lease obligations, current portion 4.1 3.5
Operating lease obligations, non-current portion 21.7 15.4
Total operating lease obligations $ 25.8 $ 18.9