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Other, Net (Schedule Of Other Net) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Nonoperating Income (Expense) [Abstract]        
Interest income   $ 6.6 $ 4.6 $ 3.4
AFUDC Equity   14.2 12.6 11.6
Charitable Contributions $ 20.7 (45.3) [1] (19.9) [1] (4.5) [1]
Pension and Other Postretirement Non Service Cost [2]   18.0 (10.6) (7.9)
Interest rate swap settlement gain [3]     0.0 0.0
Miscellaneous   3.8 (0.2) (5.6)
Total Other, net   $ 43.5 $ (13.5) $ (3.0)
[1] Includes $20.7 million related to the Greater Lawrence Incident. See Note 18, "Other Commitments and Contingencies" for additional information.
[2] See Note 11, "Pension and Other Postretirement Benefits" for additional information.
[3] See Note 9, "Risk Management Activities" for additional information.