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Restructuring and Acquisition Charges (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]    
Restructuring and acquisition charges $ 4.5 $ 7.6
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (2.8) 0.2
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 31.0 8.6
Restructuring charges 7.3 7.4
Payments made (9.4) (4.5)
Restructuring reserve, ending balance 28.9 11.5
Severance [Member]    
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 19.7 2.7
Restructuring charges 3.5 3.2
Payments made (6.9) (3.2)
Restructuring reserve, ending balance 16.3 2.7
Lease Exit [Member]    
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 5.5 5.7
Restructuring charges 1.1 0.0
Payments made 0.0 (0.4)
Restructuring reserve, ending balance 6.6 5.3
Other Acquisition Costs [Member]    
Restructuring reserve [Roll Forward]    
Restructuring reserve, beginning balance 5.8 0.2
Restructuring charges 2.7 4.2
Payments made (2.5) (0.9)
Restructuring reserve, ending balance $ 6.0 $ 3.5