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Restructuring Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Reserve [Roll Forward]            
Restructuring liability at beginning of year $ 41.1 $ 37.3 $ 61.8      
Accounting change         $ (2.4)  
Restructuring liability as of January 1, 2019, as adjusted for accounting change         38.7  
Restructuring charges 89.9 96.4 48.4      
Cash paid (96.6) (86.2) (79.0)      
Foreign currency translation adjustments and other (0.1) (6.4) 6.1      
Restructuring liability at end of year 31.9 41.1 37.3      
Current portion       $ 22.7 26.2 $ 18.9
Noncurrent portion       9.2 14.9 18.4
Total 41.1 37.3 37.3 31.9 41.1 37.3
Employee severance and termination            
Restructuring Reserve [Roll Forward]            
Restructuring liability at beginning of year 14.7 11.3 23.0      
Accounting change         0.0  
Restructuring liability as of January 1, 2019, as adjusted for accounting change         14.7  
Restructuring charges 84.3 42.2 35.2      
Cash paid (81.3) (35.5) (50.0)      
Foreign currency translation adjustments and other 1.4 (3.3) 3.1      
Restructuring liability at end of year 19.1 14.7 11.3      
Current portion       17.6 13.3 9.9
Noncurrent portion       1.5 1.4 1.4
Total 19.1 11.3 11.3 19.1 14.7 11.3
Employee severance and termination | Central and Corporate            
Restructuring Reserve [Roll Forward]            
Restructuring charges 32.3 14.2 10.0      
Employee severance and termination | U.K./Ireland            
Restructuring Reserve [Roll Forward]            
Restructuring charges 40.2 23.7 20.1      
Employee severance and termination | Switzerland            
Restructuring Reserve [Roll Forward]            
Restructuring charges 10.5          
Office closures            
Restructuring Reserve [Roll Forward]            
Restructuring liability at beginning of year 8.5 9.5 7.1      
Accounting change         (2.4)  
Restructuring liability as of January 1, 2019, as adjusted for accounting change         6.1  
Restructuring charges 1.1 5.5 8.3      
Cash paid (4.4) (6.0) (6.8)      
Foreign currency translation adjustments and other (0.6) (0.5) 0.9      
Restructuring liability at end of year 2.2 8.5 9.5      
Current portion       1.9 4.5 4.4
Noncurrent portion       0.3 4.0 5.1
Total 8.5 9.5 9.5 2.2 8.5 9.5
Contract termination            
Restructuring Reserve [Roll Forward]            
Restructuring liability at beginning of year 17.9 16.5 31.7      
Accounting change         0.0  
Restructuring liability as of January 1, 2019, as adjusted for accounting change         17.9  
Restructuring charges 4.5 48.7 4.9      
Cash paid (10.9) (44.7) (22.2)      
Foreign currency translation adjustments and other (0.9) (2.6) 2.1      
Restructuring liability at end of year 10.6 17.9 16.5      
Current portion       3.2 8.4 4.6
Noncurrent portion       7.4 9.5 11.9
Total $ 17.9 16.5 $ 16.5 $ 10.6 $ 17.9 $ 16.5
Contract termination | Belgium            
Restructuring Reserve [Roll Forward]            
Restructuring charges   $ 40.5