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Financing Arrangements - Long-term debt (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Financing Arrangements    
Less debt issuance costs (deduction from liability) $ (2.4) $ (3.1)
Total long-term debt 147.6 141.9
Principal payments during each of the next five years and thereafter    
2023 0.0  
2024 0.0  
2025 0.0  
2026 150.0  
2027 0.0  
Line Of Credit Maturities On March 2026    
Financing Arrangements    
Total debt $ 150.0 $ 145.0