Pension And Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Required term of service to be eligible for plan match					one year of service and 1,000 hours of service
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Actuarial Present Value					5.00%
Estimated nonqualified benefits in next fiscal year					$ 1.1
Non-cash pension settlement charge						$ 27.0	$ 30.4
Estimated future employer contributions					$ 40.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]						Other Nonoperating Expense	Other Nonoperating Expense
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.83%	2.72%	2.86%	2.62%	5.55%
Non-cash pension settlement charge						$ 27.0	$ 30.4
Accumulated benefit obligation	$ 536.7				$ 572.2	536.7
Employer contributions					$ 103.9	$ 44.8
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate					5.70%	2.71%	2.22%
Employer contributions					$ 4.7	$ 4.8