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Restructuring and Acquisition Charges (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring and Related Activities [Abstract]    
Restructuring and acquisition charges $ 0.7 $ 4.5
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (1.2) (2.8)
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 21.3 31.0
Restructuring charges 1.9 7.3
Payments made (4.8) (9.4)
Restructuring reserve, ending balance 18.4 28.9
Severance [Member]    
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 14.2 19.7
Restructuring charges 1.3 3.5
Payments made (3.9) (6.9)
Restructuring reserve, ending balance 11.6 16.3
Lease Exit [Member]    
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 5.7 5.5
Restructuring charges 0.2 1.1
Payments made (0.2) 0.0
Restructuring reserve, ending balance 5.7 6.6
Other Acquisition Costs [Member]    
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 1.4 5.8
Restructuring charges 0.4 2.7
Payments made (0.7) (2.5)
Restructuring reserve, ending balance $ 1.1 $ 6.0