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Pension And Other Post-Retirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position $ (103.7) $ (111.3)
Other Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Contribution to pension plans for continuing operations 0.5  
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Expected required contributions 11.7  
Contribution to pension plans for continuing operations 5.1  
Accrued Expenses [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Liability, Defined Benefit Plan, Current $ 0.7