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Financial Instruments (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Noncurrent investments | $ 3,232.4 | $ 2,966.8
Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 1,554.5 | 2,097.9
Short-term investments, debt securities | 49.0 | 24.2
Equity investments without readily determinable fair values | 384.3 | 373.9
Noncurrent investments | 3,232.4 | 2,966.8
Long-term debt, including current portion | (16,204.5) | (16,595.3)
Carrying Amount | U.S. government and agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 20.9 | 9.9
Noncurrent investments, debt securities | 109.1 | 78.7
Carrying Amount | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 7.6 | 2.8
Noncurrent investments, debt securities | 177.8 | 137.0
Carrying Amount | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 2.3 | 1.2
Noncurrent investments, debt securities | 23.8 | 24.3
Carrying Amount | Other securities, current investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 18.2 | 10.3
Carrying Amount | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Noncurrent investments, debt securities | 102.3 | 106.4
Carrying Amount | Other securities, noncurrent investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 110.3 | 110.5
Carrying Amount | Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,645.5 | 1,664.2
Carrying Amount | Equity method investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity method investments | 679.3 | 471.8
Cost |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 1,554.5 | 2,097.9
Cost | U.S. government and agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 20.8 | 9.9
Noncurrent investments, debt securities | 108.8 | 74.3
Cost | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 7.5 | 2.8
Noncurrent investments, debt securities | 175.5 | 126.8
Cost | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 2.2 | 1.2
Noncurrent investments, debt securities | 23.5 | 23.7
Cost | Other securities, current investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 18.2 | 10.3
Cost | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Noncurrent investments, debt securities | 99.7 | 101.4
Cost | Other securities, noncurrent investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 30.1 | 31.8
Cost | Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 386.1 | 311.6
Estimate of Fair Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 1,554.5 | 2,097.9
Long-term debt, including current portion | (17,462.6) | (19,038.9)
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 1,554.5 | 2,097.9
Long-term debt, including current portion | 0.0 | 0.0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0.0 | 0.0
Long-term debt, including current portion | (17,462.6) | (19,038.9)
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0.0 | 0.0
Long-term debt, including current portion | 0.0 | 0.0
Estimate of Fair Value Measurement | U.S. government and agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 20.9 | 9.9
Noncurrent investments, debt securities | 109.1 | 78.7
Estimate of Fair Value Measurement | U.S. government and agency securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 20.9 | 9.9
Noncurrent investments, debt securities | 109.1 | 78.7
Estimate of Fair Value Measurement | U.S. government and agency securities | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 0.0 | 0.0
Noncurrent investments, debt securities | 0.0 | 0.0
Estimate of Fair Value Measurement | U.S. government and agency securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 0.0 | 0.0
Noncurrent investments, debt securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 7.6 | 2.8
Noncurrent investments, debt securities | 177.8 | 137.0
Estimate of Fair Value Measurement | Corporate debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 0.0 | 0.0
Noncurrent investments, debt securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Corporate debt securities | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 7.6 | 2.8
Noncurrent investments, debt securities | 177.8 | 137.0
Estimate of Fair Value Measurement | Corporate debt securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 0.0 | 0.0
Noncurrent investments, debt securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 2.3 | 1.2
Noncurrent investments, debt securities | 23.8 | 24.3
Estimate of Fair Value Measurement | Asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 0.0 | 0.0
Noncurrent investments, debt securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Asset-backed securities | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 2.3 | 1.2
Noncurrent investments, debt securities | 23.8 | 24.3
Estimate of Fair Value Measurement | Asset-backed securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 0.0 | 0.0
Noncurrent investments, debt securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Other securities, current investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 18.2 | 10.3
Estimate of Fair Value Measurement | Other securities, current investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 18.2 | 0.0
Estimate of Fair Value Measurement | Other securities, current investments | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Other securities, current investments | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments, debt securities | 0.0 | 10.3
Estimate of Fair Value Measurement | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Noncurrent investments, debt securities | 102.3 | 106.4
Estimate of Fair Value Measurement | Mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Noncurrent investments, debt securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Mortgage-backed securities | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Noncurrent investments, debt securities | 102.3 | 106.4
Estimate of Fair Value Measurement | Mortgage-backed securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Noncurrent investments, debt securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Other securities, noncurrent investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 110.3 | 110.5
Estimate of Fair Value Measurement | Other securities, noncurrent investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Other securities, noncurrent investments | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Other securities, noncurrent investments | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 110.3 | 110.5
Estimate of Fair Value Measurement | Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,645.5 | 1,664.2
Estimate of Fair Value Measurement | Marketable equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,645.5 | 1,664.2
Estimate of Fair Value Measurement | Marketable equity securities | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0.0 | 0.0
Estimate of Fair Value Measurement | Marketable equity securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | $ 0.0 | $ 0.0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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