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Retirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]        
Curtailment (gain) loss $ (28.0)      
Defined benefit obligation, increase (decrease)   $ (1,620.0) $ 2,880.0  
Curtailment (gain) loss     159.0  
Special termination benefit     354.7  
Total accumulated benefit obligation for our defined benefit pension plans   12,760.0 13,900.0  
Expense under the plans   $ 153.5 $ 169.1 $ 175.0
Percentage of global investments in plan assets (in percentage)   80.00%    
Expected contribution   $ 45.0    
Marketable equity securities        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets, target allocation (in percentage)   70.00%    
Developed markets        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets, target allocation (in percentage)   30.00%