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Financial Instruments - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 17, 2020	Mar. 31, 2017
Foreign exchange contract
Derivatives, Fair Value [Line Items]
Notional amount	$ 263,400,000	$ 183,300,000
Realized and unrealized foreign currency transaction loss	6,200,000	5,000,000.0	$ 8,000,000.0
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Notional amount	$ 1,500,000,000	$ 1,000,000,000.0
Interest rate swap agreement 1
Derivatives, Fair Value [Line Items]
Notional amount				$ 1,250,000,000
Interest rate swap agreement 2
Derivatives, Fair Value [Line Items]
Notional amount				750,000,000.0
Interest rate swap agreement 3
Derivatives, Fair Value [Line Items]
Notional amount				$ 750,000,000.0
Convertible Debt | 1.00% Notes
Derivatives, Fair Value [Line Items]
Debt instrument, interest rate	1.00%
Convertible Debt | 1.625% Notes
Derivatives, Fair Value [Line Items]
Debt instrument, interest rate	1.625%	1.625%			1.625%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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-Publisher FASB
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-SubTopic 10
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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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