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Pension And Other Post-Retirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position $ (81.3)   $ (88.8)
Other Post-Retirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Contribution to pension plans for continuing operations     0.3
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Expected required contributions   $ 8.1  
Contribution to pension plans for continuing operations 6.7    
Accrued Expenses [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Liability, Defined Benefit Plan, Current $ 0.6   $ 1.0