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Debt - Debt Obligations (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Debt Instrument [Line Items]    
Long-term debt $ 7,837.2 $ 9,209.4
Less: Debt discount (124.6) (273.0)
Less: Debt issuance costs (25.2) (32.3)
Net long-term debt including current maturities 7,687.4 8,904.1
Less: Current maturities 0.0 (1,322.9)
Net long-term debt 7,687.4 7,581.2
Line of Credit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt 1,399.1 2,346.6
Less: Debt issuance costs (10.6) (10.0)
Senior Indebtedness    
Debt Instrument [Line Items]    
Long-term debt $ 6,999.1 7,946.6
Senior Indebtedness | 3.922% 2021 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 3.922%  
Effective Interest Rate 4.50%  
Long-term debt $ 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%  
Long-term debt $ 1,000.0 1,000.0
Less: Debt discount (1.3) (2.4)
Less: Debt issuance costs $ (2.9) (5.3)
Senior Indebtedness | 2.670% 2023 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 2.67%  
Effective Interest Rate 2.80%  
Long-term debt $ 1,000.0 1,000.0
Less: Debt discount (1.3) (2.3)
Less: Debt issuance costs $ (0.8) (1.3)
Senior Indebtedness | 0.972% 2024 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 0.972%  
Effective Interest Rate 1.10%  
Long-term debt $ 1,400.0 1,400.0
Less: Debt discount (2.5) (3.8)
Less: Debt issuance costs $ (1.3) (2.0)
Senior Indebtedness | 0.983% 2024 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 0.983%  
Effective Interest Rate 1.10%  
Long-term debt $ 1,000.0 0.0
Less: Debt discount (2.2) 0.0
Less: Debt issuance costs $ (1.4) 0.0
Senior Indebtedness | 4.250% 2025 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 4.25%  
Effective Interest Rate 4.60%  
Long-term debt $ 1,200.0 1,200.0
Less: Debt discount (10.2) (12.8)
Less: Debt issuance costs (1.3) (1.7)
Senior Indebtedness | 2020 Senior Convertible Debt    
Debt Instrument [Line Items]    
Less: Debt discount (110.0)  
Convertible Debt    
Debt Instrument [Line Items]    
Long-term debt $ 838.1 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  
Long-term debt 34.4 141.4
Less: Debt discount (3.7) (20.1)
Less: Debt issuance costs (0.1) (0.7)
Convertible debt instrument, equity component $ 11.3  
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 $ 104.2  
Long-term debt 128.1 333.3
Less: Debt discount (23.4) (71.3)
Less: Debt issuance costs (0.6) (1.8)
Convertible debt instrument, equity component $ 41.7  
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  
Long-term debt 665.5 665.5
Less: Debt discount (75.3) (101.6)
Less: Debt issuance costs (6.2) (8.3)
Convertible debt instrument, equity component 110.0  
Senior Subordinated Convertible Debt | 2017 Junior Convertible Debt    
Debt Instrument [Line Items]    
Convertible debt instrument, equity component $ 5.4  
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  
Long-term debt 10.1 122.6
Less: Debt discount (4.7) (58.4)
Less: Debt issuance costs $ 0.0 $ (0.5)