Restructuring - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Total expected pre-tax restructuring charges	$ 150
Severance & employee related costs
Restructuring Cost and Reserve [Line Items]
Percentage of aggregate charge	60.00%
Facility Closing
Restructuring Cost and Reserve [Line Items]
Percentage of aggregate charge	15.00%
Asset Write-Downs and Other Costs
Restructuring Cost and Reserve [Line Items]
Percentage of aggregate charge	25.00%