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Debt - Debt Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 01, 2020
May 31, 2020
Mar. 31, 2020
May 31, 2018
Debt Instrument [Line Items]          
Gross long-term debt including current maturities $ 9,578.6     $ 10,593.3  
Less: Debt discount (399.6)     (1,043.2)  
Less: Debt issuance costs (38.0)     (67.9)  
Net long-term debt including current maturities 9,141.0     9,482.2  
Less: Current maturities (1,493.2)     (608.8)  
Net long-term debt 7,647.8     8,873.4  
Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Gross long-term debt including current maturities 2,356.6     2,388.5  
Less: Debt issuance costs (11.1)     (14.6)  
Line of Credit | Term Loan Facility          
Debt Instrument [Line Items]          
Gross long-term debt including current maturities 0.0     1,723.5  
Less: Debt issuance costs 0.0     (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 $ 7,956.6     6,727.0  
Less: Debt discount         $ (10.5)
Less: Debt issuance costs         $ (24.4)
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 (0.8)     (2.1)  
Less: Debt issuance costs $ (1.7)     (4.8)  
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 (2.7)     (3.5)  
Less: Debt issuance costs $ (5.9)     (7.7)  
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 (2.5)     0.0  
Less: Debt issuance costs $ (1.4)     0.0  
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     0.0  
Less: Debt discount (4.1) $ (4.2)   0.0  
Less: Debt issuance costs $ (2.2)     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 (13.5)     0.0  
Less: Debt issuance costs (1.8)     0.0  
Senior Indebtedness | 2020 Senior Convertible Debt          
Debt Instrument [Line Items]          
Less: Debt discount (110.0)        
Convertible Debt          
Debt Instrument [Line Items]          
Gross long-term debt including current maturities $ 1,622.0     3,866.3  
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 $ 188.5        
Gross long-term debt including current maturities 222.4     1,110.0  
Less: Debt discount (33.3)     (192.9)  
Less: Debt issuance costs $ (1.2)     (7.0)  
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 $ 353.6        
Gross long-term debt including current maturities 455.5     2,070.0  
Less: Debt discount (100.9)     (504.2)  
Less: Debt issuance costs $ (2.6)     (13.0)  
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     0.0  
Less: Debt discount (108.0)     0.0  
Less: Debt issuance costs $ (8.9)     0.0  
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 $ 144.5        
Gross long-term debt including current maturities 278.6     686.3  
Less: Debt discount (133.8)     (337.4)  
Less: Debt issuance costs $ (1.2)     $ (3.1)