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Restructuring and Acquisition Charges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restructuring and Related Activities [Abstract]        
Restructuring and acquisition charges $ 5.4 $ 10.3 $ 9.9 $ 17.9
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 0.7   (2.1) 0.2
Gain on foreign currency derivative, acquisition payment       2.3
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     31.0 8.6
Restructuring charges     12.0 20.0
Payments made     (21.4) (11.8)
Restructuring reserve, ending balance 21.6 16.8 21.6 16.8
Severance [Member]        
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     19.7 2.7
Restructuring charges     6.4 11.1
Payments made     (15.3) (3.6)
Restructuring reserve, ending balance 10.8 10.2 10.8 10.2
Lease Exit [Member]        
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     5.5 5.7
Restructuring charges     1.3 0.0
Payments made     (0.4) (0.4)
Restructuring reserve, ending balance 6.4 5.3 6.4 5.3
Other Acquisition Costs [Member]        
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     5.8 0.2
Restructuring charges     4.3 8.9
Payments made     (5.7) (7.8)
Restructuring reserve, ending balance $ 4.4 $ 1.3 $ 4.4 $ 1.3