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Retirement Benefit Plans - Asset Allocations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Discretionary contributions to German plans   $ 30.2 $ 137.5
U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 100.00% 100.00%  
Non-U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 100.00% 100.00%  
Cash and Cash Equivalents [Member] | U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 12.00% 10.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 0.00%    
Target allocation, range maximum 14.00%    
Cash and Cash Equivalents [Member] | Non-U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 5.00% 3.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 0.00%    
Target allocation, range maximum 7.00%    
Fixed Income Funds [Member] | U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 53.00% 55.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 44.00%    
Target allocation, range maximum 64.00%    
Fixed Income Funds [Member] | Non-U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 46.00% 47.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 43.00%    
Target allocation, range maximum 53.00%    
Equity Securities [Member] | U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 35.00% 35.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 27.00%    
Target allocation, range maximum 47.00%    
Equity Securities [Member] | Non-U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 49.00% 50.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 45.00%    
Target allocation, range maximum 55.00%