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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
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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) |

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