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Pension and Other Postretirement Benefits (Schedule Of Reconciliation Of The Plans Funded Status And Amounts Reflected) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]            
Fair value of plan assets at beginning of year     $ 2,422.5 $ 2,422.5    
Fair value of plan assets at end of year       2,084.1 $ 2,422.5  
Noncurrent liabilities       (275.4) (293.1)  
Pension Plan            
Defined Benefit Plan Disclosure [Line Items]            
Benefit obligation at beginning of year [1]     2,192.6 2,192.6 2,165.8  
Service cost $ 31.3 $ 30.0   31.3 30.0 $ 30.7
Interest cost 67.1 68.3   67.1 68.3 89.7
Plan participants' contributions       0.0 0.0  
Plan amendments       0.2 0.9  
Actuarial loss (gain)       (103.9) 98.3  
Settlement Loss       0.8 1.6  
Defined Benefit Plan, Benefit Obligation, Benefits Paid       206.8 172.3  
Benefits paid       (206.8) (172.3)  
Estimated benefits paid by incurred subsidy       0.0 0.0  
Projected benefit obligation at end of year       1,981.3 2,192.6 [1] 2,165.8 [1]
Fair value of plan assets at beginning of year     2,160.0 2,160.0 1,750.9  
Actual return on plan assets       (88.4) 299.1  
Employer contributions     277.0 2.9 282.3  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant       0.0 0.0  
Fair value of plan assets at end of year       1,867.7 2,160.0 1,750.9
Defined Benefit Plan, Funded (Unfunded) Status of Plan       (113.6) (32.6)  
Noncurrent assets       0.0 9.8  
Current liabilities       (3.0) (2.8)  
Noncurrent liabilities       (110.6) (39.6)  
Net amount recognized at end of year [2]       (113.6) (32.6)  
Unrecognized prior service cost [3]       3.2 2.5  
Unrecognized actuarial loss [3]       761.2 692.9  
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Or Regulatory Asset Or Liability [3]       764.4 695.4  
Other Postretirement Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Benefit obligation at beginning of year [1]     556.3 556.3 529.0  
Service cost 5.0 4.8   5.0 4.8 5.0
Interest cost $ 17.6 $ 17.8   17.6 17.8 22.0
Plan participants' contributions       5.7 5.7  
Plan amendments       0.1 1.6  
Actuarial loss (gain)       (51.7) 36.2  
Settlement Loss       0.0 0.0  
Defined Benefit Plan, Benefit Obligation, Benefits Paid       41.1 39.3  
Benefits paid       (41.1) (39.3)  
Estimated benefits paid by incurred subsidy       0.6 0.5  
Projected benefit obligation at end of year       492.5 556.3 [1] 529.0 [1]
Fair value of plan assets at beginning of year     $ 262.5 262.5 231.4  
Actual return on plan assets       (31.8) 33.1  
Employer contributions       21.0 31.6  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant       5.7 5.7  
Fair value of plan assets at end of year       216.3 262.5 $ 231.4
Defined Benefit Plan, Funded (Unfunded) Status of Plan       (276.2) (293.8)  
Noncurrent assets       0.0 0.0  
Current liabilities       (0.8) (0.7)  
Net amount recognized at end of year [2]       (276.2) (293.8)  
Unrecognized prior service cost [3]       (19.0) (23.1)  
Unrecognized actuarial loss [3]       75.3 84.2  
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Or Regulatory Asset Or Liability [3]       $ 56.3 $ 61.1  
[1] The change in benefit obligation for Pension Benefits represents the change in Projected Benefit Obligation while the change in benefit obligation for Other Postretirement Benefits represents the change in accumulated postretirement benefit obligation.
[2] recognize our Consolidated Balance Sheets underfunded and overfunded status of our various defined benefit postretirement plans, measured as the difference between the fair value of the plan assets and the benefit obligation.
[3] determined that for certain rate-regulated subsidiaries the future recovery of pension and other postretirement benefits costs is probable. These rate-regulated subsidiaries recorded regulatory assets and liabilities of $798.3 million and $0.1 million, respectively, as of December 31, 2018, and $733.5 million and $0.1 million, respectively, as of December 31, 2017 that would otherwise have been recorded to accumulated other comprehensive loss.