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Debt - Settlement of debt (Details) - USD ($) $ in Millions	1 Months Ended									12 Months Ended
	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, 2020	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Cash Paid										$ 1,000.0	$ 0.0	$ 0.0
Value of Shares Issued										670.7	3,171.1	351.8
Net Loss on Inducements and Settlements										113.4	299.6	5.4
Long-term debt										7,837.2	9,209.4
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 Credit Facility						213.0				4,176.0	3,966.0	1,026.0
Term Loan Facility | Line of Credit
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
Senior Indebtedness
Debt Instrument [Line Items]
Long-term debt										6,999.1	7,946.6
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Net Loss on Inducements and Settlements		$ 0.6
Long-term debt										1,399.1	2,346.6
Bridge Loan Facility
Debt Instrument [Line Items]
Long-term debt									$ 615.0			$ 615.0
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
3.922% 2021 Notes | Senior Indebtedness
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
Long-term debt										0.0	1,000.0
2015 Senior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled					$ 81.0	90.0	$ 414.3	383.3	615.0
Cash Paid					81.0	48.5	414.3	383.3	615.0
Value of Shares Issued					206.5	221.0	547.6	405.1	351.8
Total					287.5	269.5	961.9	788.4	966.8
Fair Value Settled					79.2	79.4	351.7	314.4	460.4
Equity Component					208.1	184.5	592.3	464.4	461.1
Net Loss on Inducements and Settlements					10.7	9.4	25.0	7.8	$ 3.4
2015 Senior Convertible Debt | Senior Convertible Debt
Debt Instrument [Line Items]
Principal Amount Settled		36.6	$ 70.4
Cash Paid		36.6	70.4
Value of Shares Issued		103.9	159.9
Total		140.5	230.3
Fair Value Settled		36.2	71.0
Equity Component		104.2	158.9
Net Loss on Inducements and Settlements		4.1	10.6
Long-term debt										34.4	141.4
2017 Senior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled					122.2	588.8	381.8	643.9
Cash Paid					122.2	155.4	381.8	643.9
Value of Shares Issued					166.4	408.7	221.1	246.4
Total					288.6	1,165.6	602.9	890.3
Fair Value Settled					115.9	486.7	299.0	481.0
Equity Component					168.2	655.3	292.2	390.9
Net Loss on Inducements and Settlements					25.5	57.0	$ 20.1	$ 13.7
2017 Senior Convertible Debt | Senior Convertible Debt
Debt Instrument [Line Items]
Principal Amount Settled	$ 64.9	39.7	100.7
Cash Paid	64.9	39.7	100.7
Value of Shares Issued	74.6	61.4	123.5
Total	139.5	101.1	224.2
Fair Value Settled	60.0	37.4	100.0
Equity Component	75.5	63.0	113.0
Net Loss on Inducements and Settlements	$ 11.8	6.3	31.5
Long-term debt										128.1	333.3
2017 Junior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled					156.0	407.7
Cash Paid					156.0	225.0
Value of Shares Issued					217.9	530.4
Total					373.9	819.4
Fair Value Settled					129.8	246.3
Equity Component					243.9	547.1
Net Loss on Inducements and Settlements					$ 49.4	62.8
2017 Junior Convertible Debt | Junior Convertible Debt
Debt Instrument [Line Items]
Principal Amount Settled		19.9	92.5
Cash Paid		19.9	92.5
Value of Shares Issued		31.6	115.8
Total		51.5	208.3
Fair Value Settled		15.7	87.7
Equity Component		35.9	116.6
Net Loss on Inducements and Settlements		$ 5.1	$ 43.1
Long-term debt										10.1	122.6
0.983% 2024 Notes | Senior Indebtedness
Debt Instrument [Line Items]
Long-term debt										1,000.0	0.0
2020 Senior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Debt conversion, converted instrument amount						665.5
2020 Senior Convertible Debt | Long-term Debt | 2017 Senior Convertible Debt
Debt Instrument [Line Items]
Debt conversion, converted instrument amount						601.5
2020 Senior Convertible Debt | Long-term Debt | 2017 Junior Convertible Debt
Debt Instrument [Line Items]
Debt conversion, converted instrument amount						$ 64.0
2020 Senior Convertible Debt | Senior Convertible Debt
Debt Instrument [Line Items]
Long-term debt										665.5	665.5
0.972% 2024 Notes | Senior Indebtedness
Debt Instrument [Line Items]
Debt instrument, face amount										1,400.0
Long-term debt										$ 1,400.0	$ 1,400.0

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