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Pension And Other Postretirement Benefits Benefit Obligation (Schedule Of Net Funded Status) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Balance, beginning of year $ 588.3    
Balance, end of year 658.4 $ 588.3  
Paid from Company assets for unfunded nonqualified benefits 1.7 1.6  
Pension Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of period 708.8 756.3  
Service cost 25.6 28.6 $ 26.4
Interest cost 30.0 27.3 27.8
Actuarial loss (gain) 117.0 (57.7)  
Benefits paid from plan assets (52.3) (42.5)  
Benefits paid from Company assets (1.7) (1.6)  
Plan participants' contributions  
Administrative expenses paid (2.3) (1.6)  
Plan amendments  
Benefit obligation, end of period 825.1 708.8 756.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Balance, beginning of year 588.3 585.4  
Actual return on plan assets 114.7 (33.0)  
Employer contributions 11.7 81.6  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant  
Benefits paid (54.0) (44.1)  
Administrative expenses paid (2.3) (1.6)  
Balance, end of year 658.4 588.3 585.4
Unfunded status 166.7 120.5  
Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of period 72.5 76.8  
Service cost 2.0 2.3 2.3
Interest cost 2.9 2.6 2.9
Actuarial loss (gain) 3.0 (5.2)  
Benefits paid from plan assets  
Benefits paid from Company assets (5.8) (5.6)  
Plan participants' contributions 1.4 1.6  
Administrative expenses paid  
Plan amendments 0.2  
Benefit obligation, end of period 76.2 72.5 76.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Balance, beginning of year  
Actual return on plan assets  
Employer contributions 4.4 4.0  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 1.4 1.6  
Benefits paid (5.8) (5.6)  
Administrative expenses paid  
Balance, end of year
Unfunded status $ 76.2 $ 72.5