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Restructuring - Rollforward of all restructuring activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Rollforward of all restructuring activities      
Restructuring reserve balance, at the beginning of the period $ 5.6    
Restructuring Expenses 12.9 $ 27.2 $ 23.4
Use of Reserve 15.1    
Currency Translation (0.1)    
Restructuring reserve balance, at the end of the period $ 3.3 $ 5.6