Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Available-for-sale debt securities:
Available-for-sale debt securities	$ 596.8	$ 465.7
Derivative assets:
Derivative assets:	2.7	126.7
Cash equivalents
Available-for-sale debt securities:
Available-for-sale debt securities	371.6	70.6
Short-term investments
Available-for-sale debt securities:
Available-for-sale debt securities	126.2	202.6
Long-term investments
Available-for-sale debt securities:
Available-for-sale debt securities	40.9	139.6
Asset-backed and mortgage-backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	24.1	36.6
Corporate debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	121.4	270.4
Commercial paper
Available-for-sale debt securities:
Available-for-sale debt securities	20.9	0.0
Foreign government debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	5.0	8.4
Time deposits
Available-for-sale debt securities:
Available-for-sale debt securities	342.1	70.6
U.S. government agency securities
Available-for-sale debt securities:
Available-for-sale debt securities	7.9	18.0
U.S. government securities
Available-for-sale debt securities:
Available-for-sale debt securities	17.3	8.8
Privately-held debt and redeemable preferred stock securities
Available-for-sale debt securities:
Available-for-sale debt securities	58.1	52.9
Money market funds
Equity securities:
Equity securities	558.7	420.8
Publicly-traded equity securities
Equity securities:
Equity securities	7.4	7.7
Fair Value, Measurements, Recurring
Available-for-sale debt securities:
Available-for-sale debt securities	596.8	465.7
Equity securities:
Equity securities	601.1	456.6
Derivative assets:
Derivative assets:	2.7	126.7
Total assets measured at fair value on a recurring basis	1,200.6	1,049.0
Liabilities:
Derivative liabilities:	(126.3)	(125.0)
Total liabilities measured at fair value on a recurring basis	(126.3)	(125.0)
Fair Value, Measurements, Recurring | Cash equivalents
Derivative assets:
Total assets measured at fair value on a recurring basis	930.3	491.4
Fair Value, Measurements, Recurring | Short-term investments
Derivative assets:
Total assets measured at fair value on a recurring basis	133.6	210.3
Fair Value, Measurements, Recurring | Long-term investments
Derivative assets:
Total assets measured at fair value on a recurring basis	40.9	139.6
Fair Value, Measurements, Recurring | Prepaid expenses and other current assets
Derivative assets:
Total assets measured at fair value on a recurring basis	4.6	3.2
Fair Value, Measurements, Recurring | Other long-term assets
Derivative assets:
Total assets measured at fair value on a recurring basis	91.2	204.5
Fair Value, Measurements, Recurring | Other accrued liabilities
Liabilities:
Total liabilities measured at fair value on a recurring basis	(19.0)	(32.5)
Fair Value, Measurements, Recurring | Other long-term liabilities
Liabilities:
Total liabilities measured at fair value on a recurring basis	(107.3)	(92.5)
Fair Value, Measurements, Recurring | Foreign exchange contracts
Derivative assets:
Derivative assets:	2.7	1.3
Liabilities:
Derivative liabilities:	(24.8)	(37.6)
Fair Value, Measurements, Recurring | Interest rate contracts
Derivative assets:
Derivative assets:	0.0	125.4
Liabilities:
Derivative liabilities:	(101.5)	(87.4)
Fair Value, Measurements, Recurring | Asset-backed and mortgage-backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	24.1	36.6
Fair Value, Measurements, Recurring | Corporate debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	121.4	270.4
Fair Value, Measurements, Recurring | Commercial paper
Available-for-sale debt securities:
Available-for-sale debt securities	20.9	0.0
Fair Value, Measurements, Recurring | Foreign government debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	5.0	8.4
Fair Value, Measurements, Recurring | Time deposits
Available-for-sale debt securities:
Available-for-sale debt securities	342.1	70.6
Fair Value, Measurements, Recurring | U.S. government agency securities
Available-for-sale debt securities:
Available-for-sale debt securities	7.9	18.0
Fair Value, Measurements, Recurring | U.S. government securities
Available-for-sale debt securities:
Available-for-sale debt securities	17.3	8.8
Fair Value, Measurements, Recurring | Privately-held debt and redeemable preferred stock securities
Available-for-sale debt securities:
Available-for-sale debt securities	58.1	52.9
Fair Value, Measurements, Recurring | Money market funds
Equity securities:
Equity securities	558.7	420.8
Fair Value, Measurements, Recurring | Mutual funds
Equity securities:
Equity securities	35.0	28.1
Fair Value, Measurements, Recurring | Publicly-traded equity securities
Equity securities:
Equity securities	7.4	7.7
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1)
Available-for-sale debt securities:
Available-for-sale debt securities	6.7	8.8
Equity securities:
Equity securities	601.1	456.6
Derivative assets:
Derivative assets:	0.0	0.0
Total assets measured at fair value on a recurring basis	607.8	465.4
Liabilities:
Derivative liabilities:	0.0	0.0
Total liabilities measured at fair value on a recurring basis	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Cash equivalents
Derivative assets:
Total assets measured at fair value on a recurring basis	558.7	420.8
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Short-term investments
Derivative assets:
Total assets measured at fair value on a recurring basis	9.3	14.6
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Long-term investments
Derivative assets:
Total assets measured at fair value on a recurring basis	4.8	1.9
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Prepaid expenses and other current assets
Derivative assets:
Total assets measured at fair value on a recurring basis	3.0	2.4
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Other long-term assets
Derivative assets:
Total assets measured at fair value on a recurring basis	32.0	25.7
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Other accrued liabilities
Liabilities:
Total liabilities measured at fair value on a recurring basis	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Other long-term liabilities
Liabilities:
Total liabilities measured at fair value on a recurring basis	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Foreign exchange contracts
Derivative assets:
Derivative assets:	0.0	0.0
Liabilities:
Derivative liabilities:	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Interest rate contracts
Derivative assets:
Derivative assets:	0.0	0.0
Liabilities:
Derivative liabilities:	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Asset-backed and mortgage-backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Corporate debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Commercial paper
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Foreign government debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Time deposits
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | U.S. government agency securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | U.S. government securities
Available-for-sale debt securities:
Available-for-sale debt securities	6.7	8.8
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Privately-held debt and redeemable preferred stock securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Money market funds
Equity securities:
Equity securities	558.7	420.8
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Mutual funds
Equity securities:
Equity securities	35.0	28.1
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Publicly-traded equity securities
Equity securities:
Equity securities	7.4	7.7
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2)
Available-for-sale debt securities:
Available-for-sale debt securities	532.0	404.0
Equity securities:
Equity securities	0.0	0.0
Derivative assets:
Derivative assets:	2.7	126.7
Total assets measured at fair value on a recurring basis	534.7	530.7
Liabilities:
Derivative liabilities:	(126.3)	(125.0)
Total liabilities measured at fair value on a recurring basis	(126.3)	(125.0)
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Cash equivalents
Derivative assets:
Total assets measured at fair value on a recurring basis	371.6	70.6
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Short-term investments
Derivative assets:
Total assets measured at fair value on a recurring basis	124.3	195.7
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Long-term investments
Derivative assets:
Total assets measured at fair value on a recurring basis	36.1	137.7
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Prepaid expenses and other current assets
Derivative assets:
Total assets measured at fair value on a recurring basis	1.6	0.8
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Other long-term assets
Derivative assets:
Total assets measured at fair value on a recurring basis	1.1	125.9
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Other accrued liabilities
Liabilities:
Total liabilities measured at fair value on a recurring basis	(19.0)	(32.5)
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Other long-term liabilities
Liabilities:
Total liabilities measured at fair value on a recurring basis	(107.3)	(92.5)
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Foreign exchange contracts
Derivative assets:
Derivative assets:	2.7	1.3
Liabilities:
Derivative liabilities:	(24.8)	(37.6)
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Interest rate contracts
Derivative assets:
Derivative assets:	0.0	125.4
Liabilities:
Derivative liabilities:	(101.5)	(87.4)
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Asset-backed and mortgage-backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	24.1	36.6
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Corporate debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	121.4	270.4
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Commercial paper
Available-for-sale debt securities:
Available-for-sale debt securities	20.9	0.0
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Foreign government debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	5.0	8.4
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Time deposits
Available-for-sale debt securities:
Available-for-sale debt securities	342.1	70.6
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | U.S. government agency securities
Available-for-sale debt securities:
Available-for-sale debt securities	7.9	18.0
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | U.S. government securities
Available-for-sale debt securities:
Available-for-sale debt securities	10.6	0.0
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Privately-held debt and redeemable preferred stock securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Money market funds
Equity securities:
Equity securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Mutual funds
Equity securities:
Equity securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Publicly-traded equity securities
Equity securities:
Equity securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3)
Available-for-sale debt securities:
Available-for-sale debt securities	58.1	52.9
Equity securities:
Equity securities	0.0	0.0
Derivative assets:
Derivative assets:	0.0	0.0
Total assets measured at fair value on a recurring basis	58.1	52.9
Liabilities:
Derivative liabilities:	0.0	0.0
Total liabilities measured at fair value on a recurring basis	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Cash equivalents
Derivative assets:
Total assets measured at fair value on a recurring basis	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Short-term investments
Derivative assets:
Total assets measured at fair value on a recurring basis	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Long-term investments
Derivative assets:
Total assets measured at fair value on a recurring basis	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Prepaid expenses and other current assets
Derivative assets:
Total assets measured at fair value on a recurring basis	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Other long-term assets
Derivative assets:
Total assets measured at fair value on a recurring basis	58.1	52.9
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Other accrued liabilities
Liabilities:
Total liabilities measured at fair value on a recurring basis	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Other long-term liabilities
Liabilities:
Total liabilities measured at fair value on a recurring basis	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Foreign exchange contracts
Derivative assets:
Derivative assets:	0.0	0.0
Liabilities:
Derivative liabilities:	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Interest rate contracts
Derivative assets:
Derivative assets:	0.0	0.0
Liabilities:
Derivative liabilities:	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Asset-backed and mortgage-backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Corporate debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Commercial paper
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Foreign government debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Time deposits
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | U.S. government agency securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | U.S. government securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Privately-held debt and redeemable preferred stock securities
Available-for-sale debt securities:
Available-for-sale debt securities	58.1	52.9
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Money market funds
Equity securities:
Equity securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Mutual funds
Equity securities:
Equity securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Unobservable Remaining Inputs (Level 3) | Publicly-traded equity securities
Equity securities:
Equity securities	$ 0.0	$ 0.0