Intangible Assets and Goodwill - Amortization of Intangible Assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 246,800,000	$ 258,100,000	$ 498,500,000	$ 519,000,000.0
Impairment of intangible assets	0	0	0	500,000
Amortization expense charged to cost of sales
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	2,600,000	2,400,000	4,500,000	4,600,000
Amortization expense charged to operating expense
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 244,200,000	$ 255,700,000	$ 494,000,000.0	$ 514,400,000