Restructuring - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Total expected pre-tax restructuring charges	$ 150
Severance and employee related costs
Restructuring Cost and Reserve [Line Items]
Percentage of aggregate charge	55.00%
Facilities and related costs
Restructuring Cost and Reserve [Line Items]
Percentage of aggregate charge	20.00%
Asset Write-Downs and Other Costs
Restructuring Cost and Reserve [Line Items]
Percentage of aggregate charge	25.00%