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Financial Instruments - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 25, 2019	Mar. 31, 2017	Jun. 08, 2015
Derivatives, Fair Value [Line Items]
Amount of cash flow hedge ineffectiveness	$ 0
Foreign exchange contract
Derivatives, Fair Value [Line Items]
Notional amount	183,300,000	$ 157,300,000
Realized and unrealized foreign currency transaction loss	5,000,000.0	8,000,000.0	$ 6,300,000
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Notional amount	$ 1,000,000,000.0	$ 1,000,000,000.0
Interest rate swap agreement 1
Derivatives, Fair Value [Line Items]
Notional amount				$ 1,000,000,000.0
Interest rate swap agreement 2
Derivatives, Fair Value [Line Items]
Notional amount				$ 750,000,000.0
1.00% Notes
Derivatives, Fair Value [Line Items]
Debt instrument, interest rate	1.00%
1.625% Notes
Derivatives, Fair Value [Line Items]
Debt instrument, interest rate	1.625%
Convertible Debt | 1.00% Notes
Derivatives, Fair Value [Line Items]
Debt instrument, interest rate	1.00%	1.00%				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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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