CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net sales	$ 1,757.5	$ 1,352.1	$ 4,976.7	$ 3,971.3
Cost of sales	604.2	506.3	1,747.5	1,519.3
Gross profit	1,153.3	845.8	3,229.2	2,452.0
Research and development	245.4	210.1	730.0	607.9
Selling, general and administrative	177.5	154.2	531.7	445.2
Amortization of acquired intangible assets	215.7	231.6	647.0	699.9
Special (income) charges and other, net	(0.3)	4.3	20.4	8.9
Operating expenses	638.3	600.2	1,929.1	1,761.9
Operating income	515.0	245.6	1,300.1	690.1
Other income (expense):
Interest income	0.1	0.2	0.5	0.8
Interest expense	(62.1)	(86.5)	(199.2)	(278.9)
Loss on settlement of debt	(16.1)	(142.1)	(101.6)	(214.0)
Other income (loss), net	4.6	(0.4)	3.5	(2.9)
Income before income taxes	441.5	16.8	1,003.3	195.1
Income tax provision (benefit)	88.7	(19.4)	155.7	(38.3)
Net income	$ 352.8	$ 36.2	$ 847.6	$ 233.4
Basic net income per common share (in dollars per share)	$ 0.64	$ 0.07	$ 1.54	$ 0.46
Diluted net income per common share (in dollars per share)	0.62	0.07	1.50	0.44
Dividends declared per common share (in dollars per share)	$ 0.2320	$ 0.1843	$ 0.6570	$ 0.5521
Basic common shares outstanding (in shares)	554.9	526.8	551.2	511.4
Diluted common shares outstanding (in shares)	567.3	550.8	566.1	533.9