Intangible Assets and Goodwill - Amortization of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 1,046.7	$ 695.8	$ 492.2
Impairment of intangible assets	2.2	3.1	0.5
Amortization expense charged to cost of sales
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	8.9	9.6	6.1
Amortization expense charged to operating expense
Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 1,037.8	$ 686.2	$ 486.1