Special Charges and Other, Net (Details) - USD ($) $ in Millions		3 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Other Nonrecurring (Income) Expense [Abstract]
Employee separation costs		$ 45.1
Gain on sale of assets		0.0	$ (4.4)
Impairment charges		2.0	0.0
Contract exit costs		(7.0)	0.6
Other		0.0	(0.1)
Special charges and other, net	[1]	$ 40.1	$ (2.8)

[1] Includes share-based compensation expense as follows:Cost of sales 3.6 3.4 Research and development 14.1 10.3 Selling, general and administrative 11.7 8.7Special charges and other, net 15.9 0