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Restructuring and Acquisition Charges (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restructuring and Related Activities [Abstract]    
Restructuring and acquisition charges $ (18.6) $ (0.7)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 5.7 1.2
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 15.1 21.3
Restructuring charges 12.9 1.9
Payments made (14.4) (4.8)
Restructuring reserve, ending balance 13.6 18.4
Severance [Member]    
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 14.0 14.2
Restructuring charges 5.0 1.3
Payments made (7.8) (3.9)
Restructuring reserve, ending balance 11.2 11.6
Lease Exit [Member]    
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 0.6 5.7
Restructuring charges 0.0 0.2
Payments made (0.1) (0.2)
Restructuring reserve, ending balance 0.5 5.7
Other Restructuring [Member]    
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 0.5 1.4
Restructuring charges 7.9 0.4
Payments made (6.5) (0.7)
Restructuring reserve, ending balance $ 1.9 $ 1.1