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Debt - Debt Obligations (Details) - USD ($)
$ in Millions
Jun. 30, 2020
May 31, 2020
Mar. 31, 2020
May 31, 2018
Debt Instrument [Line Items]        
Gross long-term debt including current maturities $ 10,199.4   $ 10,593.3  
Less: Debt discount (815.0)   (1,043.2)  
Less: Debt issuance costs (58.1)   (67.9)  
Net long-term debt including current maturities 9,326.3   9,482.2  
Less: Current maturities (1,596.3)   (608.8)  
Net long-term debt 7,730.0   8,873.4  
Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Gross long-term debt including current maturities 1,454.6   2,388.5  
Less: Debt issuance costs (13.5)   (14.6)  
Line of Credit | Term Loan Facility        
Debt Instrument [Line Items]        
Gross long-term debt including current maturities 1,705.7   1,723.5  
Less: Debt issuance costs (13.9)   (14.6)  
Bridge Loan Facility        
Debt Instrument [Line Items]        
Gross long-term debt including current maturities 0.0   615.0  
Less: Debt discount 0.0   (3.1)  
Less: Debt issuance costs 0.0   (3.1)  
Senior Indebtedness        
Debt Instrument [Line Items]        
Gross long-term debt including current maturities $ 7,360.3   6,727.0  
Less: Debt discount       $ (10.5)
Less: Debt issuance costs       $ (24.4)
Senior Indebtedness | 4.333% 2023 Notes        
Debt Instrument [Line Items]        
Coupon Interest Rate 4.333%     4.333%
Effective Interest Rate 4.70%      
Gross long-term debt including current maturities $ 1,000.0   1,000.0  
Less: Debt discount (3.2)   (3.5)  
Less: Debt issuance costs $ (7.1)   (7.7)  
Senior Indebtedness | 3.922% 2021 Notes        
Debt Instrument [Line Items]        
Coupon Interest Rate 3.922%     3.922%
Effective Interest Rate 4.50%      
Gross long-term debt including current maturities $ 1,000.0   1,000.0  
Less: Debt discount (1.7)   (2.1)  
Less: Debt issuance costs $ (3.7)   (4.8)  
Senior Indebtedness | 2.670% 2023 Notes        
Debt Instrument [Line Items]        
Coupon Interest Rate 2.67% 2.67%    
Effective Interest Rate 2.80%      
Gross long-term debt including current maturities $ 1,000.0   0.0  
Less: Debt discount (2.9)   0.0  
Less: Debt issuance costs $ (1.7)   0.0  
Senior Indebtedness | 4.250% 2025 Notes        
Debt Instrument [Line Items]        
Coupon Interest Rate 4.25% 4.25%    
Effective Interest Rate 4.60%      
Gross long-term debt including current maturities $ 1,200.0   0.0  
Less: Debt discount (14.8)   0.0  
Less: Debt issuance costs (2.0)   0.0  
Convertible Debt        
Debt Instrument [Line Items]        
Gross long-term debt including current maturities $ 2,839.1   3,866.3  
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 $ 1,085.8      
Gross long-term debt including current maturities 1,426.1   2,070.0  
Less: Debt discount (337.0)   (504.2)  
Less: Debt issuance costs $ (8.7)   (13.0)  
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 $ 604.2      
Gross long-term debt including current maturities 726.7   1,110.0  
Less: Debt discount (120.6)   (192.9)  
Less: Debt issuance costs $ (4.4)   (7.0)  
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 $ 321.1      
Gross long-term debt including current maturities 686.3   686.3  
Less: Debt discount (334.8)   (337.4)  
Less: Debt issuance costs $ (3.1)   $ (3.1)