Special Charges and Other, Net - Special Charges (Details) - USD ($)		3 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Other Nonrecurring (Income) Expense [Abstract]
Employee separation costs		$ 6,700,000	$ 45,100,000
Impairment charges		500,000	2,000,000.0
Contract exit costs		0	(7,000,000.0)
Other		900,000	0
Total	[1]	$ 8,100,000	$ 40,100,000

[1] (1) Includes share-based compensation expense as follows: Cost of sales$4.9 $3.6Research and development$19.5 $14.1Selling, general and administrative$16.3 $11.7Special charges and other, net$— $15.9