Financial Instruments (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Noncurrent investments	$ 2,587.2	$ 3,212.6
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,047.9	2,379.5
Short-term investments	113.8	90.1
Equity investments without readily determinable fair values	614.6	548.1
Noncurrent investments	2,587.2	3,212.6
Short-term commercial paper borrowings	(2,117.1)	0.0
Long-term debt, including current portion	(14,696.7)	(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	45.6	25.7
Noncurrent investments	109.5	137.0
Carrying Amount | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	51.9	43.7
Noncurrent investments	202.4	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	0.2
Noncurrent investments	97.7	109.8
Carrying Amount | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	4.4	6.2
Noncurrent investments	41.7	23.1
Carrying Amount | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	11.7	14.3
Carrying Amount | Other securities, noncurrent investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	171.2	108.1
Carrying Amount | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	614.9	1,279.7
Carrying Amount | Equity method investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investments	735.2	771.5
Cost
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,047.9	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	46.1	25.6
Noncurrent investments	120.7	136.8
Cost | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	52.0	43.7
Noncurrent investments	226.2	232.7
Cost | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0.2	0.2
Noncurrent investments	105.5	108.1
Cost | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	4.5	6.2
Noncurrent investments	43.2	23.1
Cost | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	11.7	14.3
Cost | Other securities, noncurrent investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	81.2	22.2
Cost | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	408.0	487.0
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,047.9	2,379.5
Short-term commercial paper borrowings	(2,115.8)	0.0
Long-term debt, including current portion	(12,929.6)	(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	45.6	25.7
Noncurrent investments	109.5	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	51.9	43.7
Noncurrent investments	202.4	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	0.2
Noncurrent investments	97.7	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	4.4	6.2
Noncurrent investments	41.7	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	11.7	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	171.2	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	614.9	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	1,041.8	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	45.6	25.7
Noncurrent investments	109.5	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	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	614.9	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	6.1	18.5
Short-term commercial paper borrowings	(2,115.8)	0.0
Long-term debt, including current portion	(12,929.6)	(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	51.9	43.7
Noncurrent investments	202.4	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	0.2
Noncurrent investments	97.7	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	4.4	6.2
Noncurrent investments	41.7	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	0.0	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	47.9	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	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	11.7	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	123.3	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