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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% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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