Restructuring - Rollforward of all restructuring activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Rollforward of all restructuring activities
Restructuring reserve balance, at the beginning of the period			$ 5.6
Restructuring Expenses	$ 1.0	$ 3.7	11.0	$ 21.3
Use of Reserve			12.7
Reserve Reclassification			(0.5)
Restructuring reserve balance, at the end of the period	$ 3.4		$ 3.4