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Pension and Other Postretirement Benefits (Schedule Of Changes In The Fair Value Of The Plan Level Three Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year $ 2,422.5  
Fair value of plan assets at end of year 2,084.1 $ 2,422.5
Significant Unobservable Inputs (Level 3) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 98.9 73.1
Total gains or losses (unrealized / realized) 2.7 2.9
Purchases 2.5 43.1
(Sales) (18.0) (20.2)
Fair value of plan assets at end of year 86.1 98.9
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 49.9 9.2
Total gains or losses (unrealized / realized) 1.7 (0.6)
Purchases 1.8 42.1
(Sales) (0.7) (0.8)
Fair value of plan assets at end of year 52.7 49.9
Private Equity Limited Partnerships [Member] | U.S. Multi-Strategy [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 26.7 34.8
Total gains or losses (unrealized / realized) 2.4 2.1
Purchases 0.7 0.9
(Sales) (11.3) (11.1)
Fair value of plan assets at end of year 18.5 26.7
Private Equity Limited Partnerships [Member] | International Multi-Strategy [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 19.1 24.9
Total gains or losses (unrealized / realized) (0.6) 1.1
Purchases 0.0 0.1
(Sales) (6.0) (7.0)
Fair value of plan assets at end of year 12.5 19.1
Private Equity Limited Partnerships [Member] | Distressed Opportunities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 3.2 4.1
Total gains or losses (unrealized / realized) (0.8) 0.4
Purchases 0.0 0.0
(Sales) 0.0 (1.3)
Fair value of plan assets at end of year 2.4 3.2
Fixed Income Securities [Member] | Other Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year $ 0.0 0.1
Total gains or losses (unrealized / realized)   (0.1)
Purchases   0.0
(Sales)   0.0
Fair value of plan assets at end of year   $ 0.0