CONSOLIDATED STATEMENTS OF CASH FLOW (PARENTHETICAL) - USD ($) shares in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Supplemental disclosure of cash flow information:
Cash Paid		$ 2,611.4	$ 615.0	$ 0.0
Long-term Debt
Supplemental disclosure of cash flow information:
Principal Amount Settled	$ 1,086.5
Cash Paid	$ 428.9
Shares issued to settle convertible debt (in shares)	8.4
Long-term Debt | 2020 Senior Convertible Debt
Supplemental disclosure of cash flow information:
Debt conversion, converted instrument amount	$ 665.5