Financial Instruments (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Noncurrent investments	$ 2,574.6	$ 3,212.6
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,246.8	2,379.5
Short-term investments	124.7	90.1
Equity investments without readily determinable fair values	583.7	548.1
Noncurrent investments	2,574.6	3,212.6
Short-term commercial paper borrowings	(1,741.3)	0.0
Long-term debt, including current portion	(14,147.1)	(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	43.0	25.7
Noncurrent investments	131.4	137.0
Carrying Amount | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	51.7	43.7
Noncurrent investments	206.4	235.3
Carrying Amount | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		0.2
Noncurrent investments	143.1	109.8
Carrying Amount | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	3.0	6.2
Noncurrent investments	43.6	23.1
Carrying Amount | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	27.0	14.3
Carrying Amount | Other securities, noncurrent investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	152.5	108.1
Carrying Amount | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	549.1	1,279.7
Carrying Amount | Equity method investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investments	764.8	771.5
Cost
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,246.8	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	43.5	25.6
Noncurrent investments	148.3	136.8
Cost | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	51.8	43.7
Noncurrent investments	232.5	232.7
Cost | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		0.2
Noncurrent investments	156.1	108.1
Cost | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	3.0	6.2
Noncurrent investments	45.5	23.1
Cost | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	27.0	14.3
Cost | Other securities, noncurrent investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	96.3	22.2
Cost | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	416.1	487.0
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,246.8	2,379.5
Short-term commercial paper borrowings	(1,738.0)	0.0
Long-term debt, including current portion	(11,848.6)	(18,157.7)
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	43.0	25.7
Noncurrent investments	131.4	137.0
Estimate of Fair Value Measurement | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	51.7	43.7
Noncurrent investments	206.4	235.3
Estimate of Fair Value Measurement | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		0.2
Noncurrent investments	143.1	109.8
Estimate of Fair Value Measurement | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	3.0	6.2
Noncurrent investments	43.6	23.1
Estimate of Fair Value Measurement | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	27.0	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	152.5	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	549.1	1,279.7
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	1,239.2	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 | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	43.0	25.7
Noncurrent investments	131.4	137.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0.0	0.0
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		0.0
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0.0	0.0
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0.0	0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities, noncurrent investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0.0	0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	549.1	1,279.7
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	7.6	18.5
Short-term commercial paper borrowings	(1,738.0)	0.0
Long-term debt, including current portion	(11,848.6)	(18,157.7)
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0.0	0.0
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	51.7	43.7
Noncurrent investments	206.4	235.3
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		0.2
Noncurrent investments	143.1	109.8
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	3.0	6.2
Noncurrent investments	43.6	23.1
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	14.8	0.0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Other securities, noncurrent investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	39.5	0.0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0.0	0.0
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 | Significant Unobservable Inputs (Level 3) | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0.0	0.0
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0.0	0.0
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		0.0
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0.0	0.0
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	12.2	14.3
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Other securities, noncurrent investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	113.0	108.1
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 0.0	$ 0.0