Financing (Capitalization Of Long-Term Debt) (Details) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Disclosure [Abstract]
Total debt	$ 1,243.0
Equity	1,904.0	$ 1,835.1	$ 1,531.1	$ 1,476.3
Capitalization	$ 3,147.0
Total indebtedness to capitalization	0.395