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Retirement, Postretirement And Other Benefit Plans (Summary Of Changes In Benefit Obligation Plan Assets Funded Status And Net Periodic Benefit Cost Of Retirement And Postretirement Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Information on accumulated benefit obligation in excess of plan assets      
Company assets related to non-qualified US executive retirement plan obligation not included in plan assets $ 82.9 $ 86.1  
Retirement Benefits      
Change in benefit obligation      
Benefit obligation at beginning of year 443.6 445.5  
Service cost 0.0 0.1 $ 0.2
Interest cost 16.0 17.1 16.9
Plan amendments, curtailments, and settlements (3.2) 1.8  
Actuarial loss 9.5 4.7  
Benefits paid (27.1) (21.8)  
Other (5.4) (0.2)  
Benefit obligation at end of year 439.8 443.6 445.5
Change in plan assets      
Fair value of plan assets at beginning of period 355.5 337.9  
Actual return on plan assets 46.0 28.2  
Employer contributions 7.9 13.2  
Plan settlements (0.6) (1.8)  
Other (7.4) (0.2)  
Fair value of plan assets at end of period 374.3 355.5 337.9
Funded status at end of year (65.5) (88.1)  
Information on accumulated benefit obligation in excess of plan assets      
Projected benefit obligation / Accumulated benefit obligation 84.7 437.4  
Fair value of plan assets 0.0 349.3  
Post-Retirement Benefits      
Change in benefit obligation      
Benefit obligation at beginning of year 35.2 35.1  
Service cost 0.0 0.0 0.0
Interest cost 1.2 1.4 1.4
Plan amendments, curtailments, and settlements 0.0 0.0  
Actuarial loss 0.5 0.2  
Benefits paid (4.1) (3.6)  
Other 1.7 2.1  
Benefit obligation at end of year 34.5 35.2 35.1
Change in plan assets      
Fair value of plan assets at beginning of period 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 2.5 1.5  
Plan settlements 0.0 0.0  
Other 1.6 2.1  
Fair value of plan assets at end of period 0.0 0.0 $ 0.0
Funded status at end of year $ (34.5) $ (35.2)