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Retirement Benefit Plans - Asset Allocations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Discretionary contributions to German plans   $ 30.2  
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%
Real estate and other [Member] | U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 9.00%   12.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 0.00%    
Target allocation, range maximum 14.00%    
Real estate and other [Member] | Non-U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 5.00%   5.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 0.00%    
Target allocation, range maximum 6.00%    
Fixed income securities [Member] | U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 50.00%   53.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 41.00%    
Target allocation, range maximum 61.00%    
Fixed income securities [Member] | Non-U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 47.00%   46.00%
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 41.00%   35.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 30.00%    
Target allocation, range maximum 50.00%    
Equity securities [Member] | Non-U.S. Plans:      
Defined Benefit Plan, Assets for Plan Benefits [Abstract]      
Asset allocations 48.00%   49.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, range minimum 46.00%    
Target allocation, range maximum 56.00%