Reorganization and Restructuring (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Reorganization and Restructuring 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 6.0	$ 17.3	$ 18.1
Minimum | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Expected costs	$ 2.0
Maximum | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Expected costs	4.0
Severance Costs | Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 14.1	$ 2.2