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Debt - Debt Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Gross long-term debt including current maturities | $ 8,043.1 | $ 9,209.4
Less: Debt discount | (146.9) | (273.0)
Less: Debt issuance costs | (27.7) | (32.3)
Net long-term debt including current maturities | 7,868.5 | 8,904.1
Less: Current maturities | 0.0 | (1,322.9)
Net long-term debt | 7,868.5 | 7,581.2
Line of Credit | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Gross long-term debt including current maturities | 1,540.1 | 2,346.6
Less: Debt issuance costs | (11.2) | (10.0)
Senior Indebtedness |  |
Debt Instrument [Line Items] |  |
Gross long-term debt including current maturities | $ 7,140.1 | 7,946.6
Senior Indebtedness | 3.922% 2021 Notes |  |
Debt Instrument [Line Items] |  |
Coupon Interest Rate | 3.922% |
Effective Interest Rate | 4.50% |
Gross long-term debt including current maturities | $ 0.0 | 1,000.0
Less: Debt discount | 0.0 | (0.3)
Less: Debt issuance costs | $ 0.0 | (0.7)
Senior Indebtedness | 4.333% 2023 Notes |  |
Debt Instrument [Line Items] |  |
Coupon Interest Rate | 4.333% |
Effective Interest Rate | 4.70% |
Gross long-term debt including current maturities | $ 1,000.0 | 1,000.0
Less: Debt discount | (1.6) | (2.4)
Less: Debt issuance costs | $ (3.5) | (5.3)
Senior Indebtedness | 2.670% 2023 Notes |  |
Debt Instrument [Line Items] |  |
Coupon Interest Rate | 2.67% |
Effective Interest Rate | 2.80% |
Gross long-term debt including current maturities | $ 1,000.0 | 1,000.0
Less: Debt discount | (1.6) | (2.3)
Less: Debt issuance costs | $ (0.9) | (1.3)
Senior Indebtedness | 0.972% 2024 Notes |  |
Debt Instrument [Line Items] |  |
Coupon Interest Rate | 0.972% |
Effective Interest Rate | 1.10% |
Gross long-term debt including current maturities | $ 1,400.0 | 1,400.0
Less: Debt discount | (2.8) | (3.8)
Less: Debt issuance costs | $ (1.5) | (2.0)
Senior Indebtedness | 0.983% 2024 Notes |  |
Debt Instrument [Line Items] |  |
Coupon Interest Rate | 0.983% |
Effective Interest Rate | 1.10% |
Gross long-term debt including current maturities | $ 1,000.0 | 0.0
Less: Debt discount | (2.5) | 0.0
Less: Debt issuance costs | $ (1.5) | 0.0
Senior Indebtedness | 4.250% 2025 Notes |  |
Debt Instrument [Line Items] |  |
Coupon Interest Rate | 4.25% |
Effective Interest Rate | 4.60% |
Gross long-term debt including current maturities | $ 1,200.0 | 1,200.0
Less: Debt discount | (10.8) | (12.8)
Less: Debt issuance costs | (1.4) | (1.7)
Convertible Debt |  |
Debt Instrument [Line Items] |  |
Gross long-term debt including current maturities | $ 903.0 | 1,262.8
Senior Subordinated Convertible Debt | 2015 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Coupon Interest Rate | 1.625% |
Effective Interest Rate | 5.90% |
Fair Value of Liability Component at Issuance | $ 30.4 |
Gross long-term debt including current maturities | 34.4 | 141.4
Less: Debt discount | (4.0) | (20.1)
Less: Debt issuance costs | $ (0.1) | (0.7)
Senior Subordinated Convertible Debt | 2017 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Coupon Interest Rate | 1.625% |
Effective Interest Rate | 6.00% |
Fair Value of Liability Component at Issuance | $ 155.9 |
Gross long-term debt including current maturities | 193.0 | 333.3
Less: Debt discount | (36.9) | (71.3)
Less: Debt issuance costs | $ (0.9) | (1.8)
Senior Subordinated Convertible Debt | 2020 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Coupon Interest Rate | 0.125% |
Effective Interest Rate | 5.10% |
Fair Value of Liability Component at Issuance | $ 555.5 |
Gross long-term debt including current maturities | 665.5 | 665.5
Less: Debt discount | (82.0) | (101.6)
Less: Debt issuance costs | $ (6.7) | (8.3)
Junior Subordinated Convertible Debt | 2017 Junior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Coupon Interest Rate | 2.25% |
Effective Interest Rate | 7.40% |
Fair Value of Liability Component at Issuance | $ 5.4 |
Gross long-term debt including current maturities | 10.1 | 122.6
Less: Debt discount | (4.7) | (58.4)
Less: Debt issuance costs | $ 0.0 | $ (0.5)

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