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Restructuring and Acquisition Charges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring and Related Activities [Abstract]        
Restructuring and acquisition charges $ (70.0) $ (3.7) $ (114.3) $ 6.7
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 0.7 2.7 20.7 17.5
Share-based Payment Arrangement, Noncash Expense     14.0  
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     15.1 21.3
Restructuring charges     79.6 10.8
Payments made     (77.5) (18.8)
Restructuring reserve, ending balance 17.2 13.3 17.2 13.3
Severance [Member]        
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     14.0 14.2
Restructuring charges     17.6 9.8
Payments made     (21.2) (16.1)
Restructuring reserve, ending balance 10.4 7.9 10.4 7.9
Lease Exit [Member]        
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     0.6 5.7
Restructuring charges     5.8 0.2
Payments made     (1.5) (0.5)
Restructuring reserve, ending balance 4.9 5.4 4.9 5.4
Other Restructuring [Member]        
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     0.5 1.4
Restructuring charges     56.2 0.8
Payments made     (54.8) (2.2)
Restructuring reserve, ending balance $ 1.9 $ 0.0 $ 1.9 $ 0.0