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Debt - Debt Obligations (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Mar. 27, 2020
Mar. 31, 2019
May 31, 2018
Feb. 28, 2017
Feb. 28, 2015
Debt Instrument [Line Items]            
Gross long-term debt including current maturities $ 10,593.3   $ 11,659.3      
Less: Debt discount (1,043.2)   (1,268.7)      
Less: Debt issuance costs (67.9)   (83.6)   $ (33.7)  
Net long-term debt including current maturities 9,482.2   10,307.0      
Less: Current maturities (608.8)   (1,360.8)      
Net long-term debt 8,873.4   8,946.2      
2015 Senior Convertible Debt            
Debt Instrument [Line Items]            
Less: Debt issuance costs           $ (30.3)
Senior Secured Indebtedness            
Debt Instrument [Line Items]            
Gross long-term debt including current maturities 6,727.0   7,178.0      
Line of Credit            
Debt Instrument [Line Items]            
Less: Debt issuance costs (3.9)          
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Gross long-term debt including current maturities 2,388.5   3,266.5      
Less: Debt issuance costs (14.6)   (14.7)      
Line of Credit | Term Loan Facility            
Debt Instrument [Line Items]            
Gross long-term debt including current maturities 1,723.5   1,911.5      
Less: Debt issuance costs (14.6)   (19.4) $ (34.7)    
Bridge Loan Facility            
Debt Instrument [Line Items]            
Gross long-term debt including current maturities 615.0   0.0      
Less: Debt discount (3.1)   0.0      
Less: Debt issuance costs $ (3.1) $ (6.2) 0.0      
Senior Notes            
Debt Instrument [Line Items]            
Less: Debt discount       (10.5)    
Less: Debt issuance costs       $ (24.4)    
Senior Notes | 2023 Senior Secured 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 (3.5)   (4.4)      
Less: Debt issuance costs $ (7.7)   (10.2)      
Senior Notes | 2021 Senior Secured 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 (2.1)   (3.8)      
Less: Debt issuance costs (4.8)   (8.8)      
Convertible Debt            
Debt Instrument [Line Items]            
Gross long-term debt including current maturities $ 3,866.3   4,481.3      
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 $ 1,396.3          
Gross long-term debt including current maturities 2,070.0   2,070.0      
Less: Debt discount (504.2)   (561.9)      
Less: Debt issuance costs $ (13.0)   (14.5)      
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 $ 916.8          
Gross long-term debt including current maturities 1,110.0   1,725.0      
Less: Debt discount (192.9)   (351.4)      
Less: Debt issuance costs $ (7.0)   (12.8)      
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 (337.4)   (347.2)      
Less: Debt issuance costs $ (3.1)   $ (3.2)