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	Dec. 31, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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%						5.00%
Estimated nonqualified benefits in next fiscal year							$ 3.9
Non-cash pension settlement charge							$ 27.0	$ 30.4	$ 27.7
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	Other Nonoperating Expense
Estimated future employer contributions	$ 40.0						$ 40.0
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.83%	2.72%	2.72%	2.86%	2.62%	3.38%
Non-cash pension settlement charge							27.0	$ 30.4	$ 27.7
Accumulated benefit obligation	$ 536.7	$ 774.7					$ 536.7	$ 774.7
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate							2.71%	2.22%	3.19%