Pension And Other Retirement Plans Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2019
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 24.5
Scenario, Forecast | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 3.0
Scenario, Forecast | Other Post Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 1.0