Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative assets:
Derivative assets:	$ 113.4	$ 126.7
Money market funds
Equity securities:
Equity securities	496.7	420.8
Publicly-traded equity securities
Equity securities:
Equity securities	6.5	7.7
Fair Value, Measurements, Recurring
Available-for-sale debt securities:
Available-for-sale debt securities	408.8	465.7
Equity securities:
Equity securities	535.1	456.6
Derivative assets:
Derivative assets:	113.3	126.7
Total assets measured at fair value on a recurring basis	1,057.2	1,049.0
Liabilities:
Derivative liabilities:	(98.8)	(125.0)
Total liabilities measured at fair value on a recurring basis	(98.8)	(125.0)
Fair Value, Measurements, Recurring | Cash equivalents
Derivative assets:
Total assets measured at fair value on a recurring basis	586.4	491.4
Fair Value, Measurements, Recurring | Short-term investments
Derivative assets:
Total assets measured at fair value on a recurring basis	174.9	210.3
Fair Value, Measurements, Recurring | Long-term investments
Derivative assets:
Total assets measured at fair value on a recurring basis	92.6	139.6
Fair Value, Measurements, Recurring | Prepaid expenses and other current assets
Derivative assets:
Total assets measured at fair value on a recurring basis	3.7	3.2
Fair Value, Measurements, Recurring | Other long-term assets
Derivative assets:
Total assets measured at fair value on a recurring basis	199.6	204.5
Fair Value, Measurements, Recurring | Other accrued liabilities
Liabilities:
Total liabilities measured at fair value on a recurring basis	(22.6)	(32.5)
Fair Value, Measurements, Recurring | Other long-term liabilities
Liabilities:
Total liabilities measured at fair value on a recurring basis	(76.2)	(92.5)
Fair Value, Measurements, Recurring | Foreign exchange contracts
Derivative assets:
Derivative assets:	1.9	1.3
Liabilities:
Derivative liabilities:	(26.4)	(37.6)
Fair Value, Measurements, Recurring | Interest rate contracts
Derivative assets:
Derivative assets:	111.4	125.4
Liabilities:
Derivative liabilities:	(72.4)	(87.4)
Fair Value, Measurements, Recurring | Asset-backed and mortgage-backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	23.8	36.6
Fair Value, Measurements, Recurring | Corporate debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	205.6	270.4
Fair Value, Measurements, Recurring | Foreign government debt securities
Available-for-sale debt securities:
Available-for-sale debt securities	8.5	8.4
Fair Value, Measurements, Recurring | Time deposits
Available-for-sale debt securities:
Available-for-sale debt securities	89.7	70.6
Fair Value, Measurements, Recurring | U.S. government agency securities
Available-for-sale debt securities:
Available-for-sale debt securities	18.2	18.0
Fair Value, Measurements, Recurring | U.S. government securities
Available-for-sale debt securities:
Available-for-sale debt securities	4.9	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	496.7	420.8
Fair Value, Measurements, Recurring | Mutual funds
Equity securities:
Equity securities	31.9	28.1
Fair Value, Measurements, Recurring | Publicly-traded equity securities
Equity securities:
Equity securities	6.5	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	4.9	8.8
Equity securities:
Equity securities	535.1	456.6
Derivative assets:
Derivative assets:	0.0	0.0
Total assets measured at fair value on a recurring basis	540.0	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	496.7	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	9.5	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	1.9	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	2.5	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	29.4	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) | 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	4.9	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	496.7	420.8
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Mutual funds
Equity securities:
Equity securities	31.9	28.1
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets For Identical Assets (Level 1) | Publicly-traded equity securities
Equity securities:
Equity securities	6.5	7.7
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2)
Available-for-sale debt securities:
Available-for-sale debt securities	345.8	404.0
Equity securities:
Equity securities	0.0	0.0
Derivative assets:
Derivative assets:	113.3	126.7
Total assets measured at fair value on a recurring basis	459.1	530.7
Liabilities:
Derivative liabilities:	(98.8)	(125.0)
Total liabilities measured at fair value on a recurring basis	(98.8)	(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	89.7	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	165.4	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	90.7	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	1.2	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	112.1	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	(22.6)	(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	(76.2)	(92.5)
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Foreign exchange contracts
Derivative assets:
Derivative assets:	1.9	1.3
Liabilities:
Derivative liabilities:	(26.4)	(37.6)
Fair Value, Measurements, Recurring | Significant Other Observable Remaining Inputs (Level 2) | Interest rate contracts
Derivative assets:
Derivative assets:	111.4	125.4
Liabilities:
Derivative liabilities:	(72.4)	(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	23.8	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	205.6	270.4
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	8.5	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	89.7	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	18.2	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	0.0	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) | 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