CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 1,569.4	$ 1,309.7
Cost of sales	561.8	511.4
Gross profit	1,007.6	798.3
Research and development	238.4	198.0
Selling, general and administrative	174.3	146.3
Amortization of acquired intangible assets	215.6	235.4
Special charges and other, net	10.5	0.3
Operating expenses	638.8	580.0
Operating income	368.8	218.3
Other income (expense):
Interest income	0.3	0.3
Interest expense	(72.3)	(99.1)
Loss on settlement of debt	(0.3)	(26.8)
Other income (loss), net	0.5	(3.2)
Income before income taxes	297.0	89.5
Income tax provision (benefit)	44.2	(34.1)
Net income	$ 252.8	$ 123.6
Basic net income per common share (in dollars per share)	$ 0.92	$ 0.50
Diluted net income per common share (in dollars per share)	0.89	0.48
Dividends declared per common share (in dollars per share)	$ 0.4130	$ 0.3675
Basic common shares outstanding (in shares)	273.8	247.7
Diluted common shares outstanding (in shares)	282.6	257.8