Pension And Other Retirement Plans Narrative (Details) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
	Jul. 12, 2018	Jun. 30, 2018	Dec. 31, 2018
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 24.5
Subsequent Event | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 5.5
Scenario, Forecast | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			$ 36.0
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year			6.0
Scenario, Forecast | Other Post Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			$ 1.0