Pension And Other Post-Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position		$ (105.3)		$ (108.1)
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			$ 12.3
Contribution to pension plans for continuing operations		1.8
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year			$ 7.9
Accrued Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Current		$ 0.7