Financial Instruments (Schedule of Fair Value Measurement) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Statement [Line Items]
Noncurrent investments	$ 3,052.2	$ 2,901.8
Carrying Amount
Statement [Line Items]
Cash equivalents	1,088.4	657.4
Short-term investments	109.1	144.8
Equity investments without readily determinable fair values	608.0	478.4
Noncurrent investments	3,052.2	2,901.8
Carrying Amount | U.S. government and agency securities
Statement [Line Items]
Short-term investments	32.1	30.8
Noncurrent investments	148.1	146.4
Carrying Amount | Corporate debt securities
Statement [Line Items]
Short-term investments	52.0	53.4
Noncurrent investments	214.3	213.9
Carrying Amount | Mortgage-backed securities
Statement [Line Items]
Noncurrent investments	157.3	149.2
Carrying Amount | Asset-backed securities
Statement [Line Items]
Short-term investments		2.0
Noncurrent investments	53.5	50.6
Carrying Amount | Other securities
Statement [Line Items]
Short-term investments	25.0	58.6
Carrying Amount | Other securities, noncurrent investments
Statement [Line Items]
Equity securities	197.4	398.6
Carrying Amount | Marketable equity securities
Statement [Line Items]
Equity securities	711.3	683.6
Carrying Amount | Equity method investments
Statement [Line Items]
Equity method investments	962.3	781.1
Cost
Statement [Line Items]
Cash equivalents	1,088.4	657.4
Cost | U.S. government and agency securities
Statement [Line Items]
Short-term investments	32.3	31.1
Noncurrent investments	161.0	163.2
Cost | Corporate debt securities
Statement [Line Items]
Short-term investments	52.1	53.5
Noncurrent investments	226.6	235.8
Cost | Mortgage-backed securities
Statement [Line Items]
Noncurrent investments	167.1	161.5
Cost | Asset-backed securities
Statement [Line Items]
Short-term investments		2.0
Noncurrent investments	54.4	52.5
Cost | Other securities
Statement [Line Items]
Short-term investments	25.0	58.6
Cost | Other securities, noncurrent investments
Statement [Line Items]
Equity securities	100.2	34.5
Cost | Marketable equity securities
Statement [Line Items]
Equity securities	493.2	484.7
Estimate of Fair Value Measurement
Statement [Line Items]
Cash equivalents	1,088.4	657.4
Estimate of Fair Value Measurement | U.S. government and agency securities
Statement [Line Items]
Short-term investments	32.1	30.8
Noncurrent investments	148.1	146.4
Estimate of Fair Value Measurement | Corporate debt securities
Statement [Line Items]
Short-term investments	52.0	53.4
Noncurrent investments	214.3	213.9
Estimate of Fair Value Measurement | Mortgage-backed securities
Statement [Line Items]
Noncurrent investments	157.3	149.2
Estimate of Fair Value Measurement | Asset-backed securities
Statement [Line Items]
Short-term investments		2.0
Noncurrent investments	53.5	50.6
Estimate of Fair Value Measurement | Other securities
Statement [Line Items]
Short-term investments	25.0	58.6
Estimate of Fair Value Measurement | Other securities, noncurrent investments
Statement [Line Items]
Equity securities	197.4	398.6
Estimate of Fair Value Measurement | Marketable equity securities
Statement [Line Items]
Equity securities	711.3	683.6
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Statement [Line Items]
Cash equivalents	1,079.3	650.4
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and agency securities
Statement [Line Items]
Short-term investments	32.1	30.8
Noncurrent investments	148.1	146.4
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities
Statement [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
Statement [Line Items]
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities
Statement [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) | Other securities
Statement [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
Statement [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
Statement [Line Items]
Equity securities	711.3	683.6
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)
Statement [Line Items]
Cash equivalents	9.1	7.0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | U.S. government and agency securities
Statement [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
Statement [Line Items]
Short-term investments	52.0	53.4
Noncurrent investments	214.3	213.9
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities
Statement [Line Items]
Noncurrent investments	157.3	149.2
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Statement [Line Items]
Short-term investments		2.0
Noncurrent investments	53.5	50.6
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Other securities
Statement [Line Items]
Short-term investments	13.6	39.1
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Other securities, noncurrent investments
Statement [Line Items]
Equity securities	23.5	311.0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Marketable equity securities
Statement [Line Items]
Equity securities	0.0	0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)
Statement [Line Items]
Cash equivalents	0.0	0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | U.S. government and agency securities
Statement [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
Statement [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
Statement [Line Items]
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Asset-backed securities
Statement [Line Items]
Short-term investments		0.0
Noncurrent investments	0.0	0.0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Other securities
Statement [Line Items]
Short-term investments	11.4	19.5
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Other securities, noncurrent investments
Statement [Line Items]
Equity securities	173.9	87.6
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Marketable equity securities
Statement [Line Items]
Equity securities	$ 0.0	$ 0.0