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Restructuring Costs (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 75 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2017
Cash paid for restructuring activities $ 15.0 $ 14.7  
Project Renewal [Member]      
Expected completion year     Dec. 31, 2017
Minimum [Member] | Project Renewal [Member]      
Expected cumulative restructuring and other costs 690.0    
Restructuring and Restructuring Related Cost, Expected Cash Cost $ 645.0    
Restructuring Costs as a percentage of total costs 60.00%    
Maximum [Member] | Project Renewal [Member]      
Expected cumulative restructuring and other costs $ 725.0    
Restructuring and Restructuring Related Cost, Expected Cash Cost $ 675.0    
Restructuring Costs as a percentage of total costs 70.00%