Special Charges and Other, Net - Narrative (Details) - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Employee separation costs	$ 6,700,000	$ 45,100,000
Contract exit costs	0	(7,000,000.0)
Employee Separation | Semiconductor products
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	112,300,000
Employee separation costs	6,700,000	$ 45,100,000
Contract Termination | Semiconductor products
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	$ 40,100,000