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Debt - Debt Obligations (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Mar. 31, 2021
Debt Instrument [Line Items]    
Gross long-term debt including current maturities $ 8,405.8 $ 9,209.4
Less: Debt discount (178.9) (273.0)
Less: Debt issuance costs (26.3) (32.3)
Net long-term debt including current maturities 8,200.6 8,904.1
Less: Current maturities 0.0 (1,322.9)
Net long-term debt 8,200.6 7,581.2
Line of Credit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Gross long-term debt including current maturities 1,806.6 2,346.6
Less: Debt issuance costs (7.6) (10.0)
Senior Indebtedness    
Debt Instrument [Line Items]    
Gross long-term debt including current maturities $ 7,406.6 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 (1.9) (2.4)
Less: Debt issuance costs $ (4.1) (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 (1.8) (2.3)
Less: Debt issuance costs $ (1.0) (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 (3.2) (3.8)
Less: Debt issuance costs $ (1.6) (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 (2.7) 0.0
Less: Debt issuance costs $ (1.6) 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 (11.5) (12.8)
Less: Debt issuance costs (1.5) (1.7)
Convertible Debt    
Debt Instrument [Line Items]    
Gross long-term debt including current maturities $ 999.2 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 $ 61.8  
Gross long-term debt including current maturities 71.0 141.4
Less: Debt discount (8.9) (20.1)
Less: Debt issuance costs $ (0.3) (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 $ 185.6  
Gross long-term debt including current maturities 232.6 333.3
Less: Debt discount (46.2) (71.3)
Less: Debt issuance costs $ (1.2) (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 (88.6) (101.6)
Less: Debt issuance costs $ (7.3) (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 $ 16.0  
Gross long-term debt including current maturities 30.1 122.6
Less: Debt discount (14.1) (58.4)
Less: Debt issuance costs $ (0.1) $ (0.5)