Reorganization and Restructuring (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Reorganization and Restructuring 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 11.3	$ 17.3	$ 18.1
Minimum | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Expected costs	$ 1.0
Maximum | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Expected costs	3.0
Severance Costs | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 20.5	$ 4.2