Financial Instruments (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Noncurrent investments	$ 2,727.3	$ 3,212.6
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,104.1	2,379.5
Short-term investments, debt securities	109.1	90.1
Equity investments without readily determinable fair values	569.5	548.1
Noncurrent investments	2,727.3	3,212.6
Short-term commercial paper borrowings	(499.7)	0.0
Long-term debt, including current portion	(16,009.1)	(16,884.7)
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	45.1	25.7
Noncurrent investments, debt securities	116.2	137.0
Carrying Amount | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments, debt securities	50.6	43.7
Noncurrent investments, debt securities	212.3	235.3
Carrying Amount | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments, debt securities	0.2	0.2
Noncurrent investments, debt securities	105.1	109.8
Carrying Amount | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments, debt securities	2.9	6.2
Noncurrent investments, debt securities	34.6	23.1
Carrying Amount | Other securities, current investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments, debt securities	10.3	14.3
Carrying Amount | Other securities, noncurrent investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	112.5	108.1
Carrying Amount | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	807.9	1,279.7
Carrying Amount | Equity method investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investments	769.2	771.5
Cost
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,104.1	2,379.5
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	45.4	25.6
Noncurrent investments, debt securities	123.0	136.8
Cost | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments, debt securities	50.7	43.7
Noncurrent investments, debt securities	224.3	232.7
Cost | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments, debt securities	0.2	0.2
Noncurrent investments, debt securities	109.0	108.1
Cost | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments, debt securities	3.0	6.2
Noncurrent investments, debt securities	35.4	23.1
Cost | Other securities, current investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments, debt securities	10.3	14.3
Cost | Other securities, noncurrent investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	15.3	22.2
Cost | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	481.9	487.0
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,104.1	2,379.5
Short-term commercial paper borrowings	(499.7)	0.0
Long-term debt, including current portion	(15,798.9)	(18,157.7)
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	1,095.0	2,361.0
Short-term commercial paper borrowings	0.0	0.0
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	9.1	18.5
Short-term commercial paper borrowings	(499.7)	0.0
Long-term debt, including current portion	(15,798.9)	(18,157.7)
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
Short-term commercial paper borrowings	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	45.1	25.7
Noncurrent investments, debt securities	116.2	137.0
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	45.1	25.7
Noncurrent investments, debt securities	116.2	137.0
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	50.6	43.7
Noncurrent investments, debt securities	224.3	235.3
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	50.6	43.7
Noncurrent investments, debt securities	224.3	235.3
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 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments, debt securities	0.2	0.2
Noncurrent investments, debt securities	105.1	109.8
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]
Short-term investments, debt securities	0.0	0.0
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]
Short-term investments, debt securities	0.2	0.2
Noncurrent investments, debt securities	105.1	109.8
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]
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	2.9	6.2
Noncurrent investments, debt securities	34.6	23.1
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	2.9	6.2
Noncurrent investments, debt securities	34.6	23.1
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	10.3	14.3
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	0.0	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	10.3	14.3
Estimate of Fair Value Measurement | Other securities, noncurrent investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	112.5	108.1
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	112.5	108.1
Estimate of Fair Value Measurement | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	807.9	1,279.7
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	807.9	1,279.7
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