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Debt - Settlement of debt (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended										12 Months Ended
	Aug. 31, 2022	May 31, 2022	Feb. 28, 2022	Dec. 31, 2021	Aug. 31, 2021	Jun. 30, 2021	Feb. 28, 2021	Dec. 31, 2020	Aug. 31, 2020	Jun. 30, 2020	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Debt Instrument [Line Items]
Cash Paid											$ 0.0	$ 1,000.0	$ 0.0
Value of Shares Issued												670.7	3,171.1
Net Loss on Inducements and Settlements											8.3	113.4	299.6
Debt instrument, unamortized discount											10.4	124.6
Maximum
Debt Instrument [Line Items]
Option indexed to equity, strike price (in dollars per share)								$ 116.79
Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled								$ 1,086.5
Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from borrowings on revolving loan under credit facility								213.0			5,935.0	4,176.0	$ 3,966.0
Line of Credit | Revolving Credit Facility | Long-term Debt
Debt Instrument [Line Items]
Net Loss on Inducements and Settlements				$ 0.6
Line of Credit | Term Loan Facility | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled								1,705.7		$ 17.8
Cash Paid								1,705.7		17.8
Total								1,705.7		17.8
Net Loss on Inducements and Settlements								12.9
Bridge Loan Facility | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled										615.0
Cash Paid										615.0
Total										615.0
Net Loss on Inducements and Settlements										5.3
2015 Senior Convertible Debt | Senior Convertible Debt
Debt Instrument [Line Items]
Debt instrument, unamortized discount											0.0	3.7
2015 Senior Convertible Debt | Senior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled	$ 22.0			36.6	$ 70.4		$ 81.0	90.0	$ 414.3	383.3
Cash Paid	67.7			36.6	70.4		81.0	48.5	414.3	383.3
Value of Shares Issued				103.9	159.9		206.5	221.0	547.6	405.1
Total	67.7			140.5	230.3		287.5	269.5	961.9	788.4
Fair Value Settled				36.2	71.0		79.2	79.4	351.7	314.4
Equity Component				104.2	158.9		208.1	184.5	592.3	464.4
Net Loss on Inducements and Settlements	1.3			4.1	10.6		10.7	9.4	25.0	7.8
2017 Senior Convertible Debt | Senior Convertible Debt
Debt Instrument [Line Items]
Debt instrument, unamortized discount											0.0	23.4
2017 Senior Convertible Debt | Senior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled	14.9	$ 31.0	$ 64.9	39.7	100.7		122.2	588.8	381.8	643.9
Cash Paid	29.2	65.3	64.9	39.7	100.7		122.2	155.4	381.8	643.9
Value of Shares Issued			74.6	61.4	123.5		166.4	408.7	221.1	246.4
Total	29.2	65.3	139.5	101.1	224.2		288.6	1,165.6	602.9	890.3
Fair Value Settled			60.0	37.4	100.0		115.9	486.7	299.0	481.0
Equity Component			75.5	63.0	113.0		168.2	655.3	292.2	390.9
Net Loss on Inducements and Settlements	$ 0.8	5.9	$ 11.8	6.3	31.5		25.5	57.0	$ 20.1	$ 13.7
2017 Junior Convertible Debt | Junior Convertible Debt
Debt Instrument [Line Items]
Debt instrument, unamortized discount											0.0	4.7
2017 Junior Convertible Debt | Junior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled		3.6		19.9	92.5		156.0	407.7
Cash Paid		8.2		19.9	92.5		156.0	225.0
Value of Shares Issued				31.6	115.8		217.9	530.4
Total		8.2		51.5	208.3		373.9	819.4
Fair Value Settled				15.7	87.7		129.8	246.3
Equity Component				35.9	116.6		243.9	547.1
Net Loss on Inducements and Settlements		$ 0.3		$ 5.1	$ 43.1		$ 49.4	62.8
2020 Senior Convertible Debt | 2017 Senior Convertible Debt
Debt Instrument [Line Items]
Debt conversion, converted instrument amount								601.5
2020 Senior Convertible Debt | 2017 Junior Convertible Debt
Debt Instrument [Line Items]
Debt conversion, converted instrument amount								64.0
2020 Senior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Debt conversion, converted instrument amount								665.5
2020 Senior Convertible Debt | Senior Convertible Debt
Debt Instrument [Line Items]
Debt issuance costs, including equity portion, gross								10.8
Debt instrument, unamortized discount											0.0	75.3
Capped options indexed to equity, costs								$ 35.8
3.922% 2021 Notes | Senior Indebtedness | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled						$ 1,000.0
Cash Paid						1,000.0
Total						1,000.0
Net Loss on Inducements and Settlements						$ 0.3
0.972% 2024 Notes | Senior Indebtedness
Debt Instrument [Line Items]
Debt instrument, face amount											1,400.0
Debt instrument, unamortized discount											$ 1.2	$ 2.5

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