Restructuring - Roll-forward of Restructuring Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Rollforward of all restructuring activities
Restructuring reserve balance, at the beginning of the period			$ 8.2
Restructuring Expenses	$ 3.7	$ 3.9	21.3	$ 17.1
Cash Use of Reserve			20.8
Non-Cash Use of Reserve			4.8
Restructuring reserve balance, at the end of the period	$ 3.9		$ 3.9