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Convertible Notes - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) item $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Nov. 14, 2013 USD ($)
Convertible Senior Notes 0.375 Percent Due 2018 and Convertible Senior Notes 1.25 Percent Due 2020 |  |  |  |
Convertible Notes |  |  |  |
Number of days within 30 consecutive trading days in which the price of the entity's common stock must exceed the conversion price for the notes to be converted | 20 days |  |  |
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible | 30 days |  |  |
Percentage of the closing sales price of common stock that the conversion price must exceed in order for the notes to be convertible (as a percent) | 130.00% |  |  |
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period | item | 5 |  |  |
Number of consecutive trading days before five consecutive business days during the note measurement period | item | 5 |  |  |
Conversion ratio, principal amount of note | 1,000 |  |  |
Percentage of the trading price to the product of the last reported sale price of the common stock and the conversion rate, maximum (as a percent) | 98.00% |  |  |
Convertible Senior Notes 0.375 Percent Due 2018 |  |  |  |
Convertible Notes |  |  |  |
Aggregate principal amount of notes |  |  |  | $ 375.0
Interest rate of debt (as a percent) | 0.375% | 0.375% | 0.375% |
Aggregate principal amount of notes converted |  | $ 367.2 |  |
Debt exchange expense |  | 54.9 |  |
Convertible Senior Notes 0.375 Percent Due 2018 | Director |  |  |  |
Convertible Notes |  |  |  |
Aggregate principal amount of notes converted |  | $ 259.0 |  |
Convertible Senior Notes 1.25 Percent Due 2020 |  |  |  |
Convertible Notes |  |  |  |
Aggregate principal amount of notes |  |  |  | 375.0
Carrying value of notes | $ 18.3 |  | $ 17.4 |
Interest rate of debt (as a percent) | 1.25% | 1.25% |  |
Conversion ratio, principal amount of note | 0.193207 |  |  |
Conversion ratio, principal amount, denominator | 1,000 |  |  |
Conversion price per share (in dollars per share) | $ / shares | $ 51.76 |  |  |
Repurchase price as a percentage of principal | 100.00% |  |  |
Liability on notes on the date of issuance |  |  |  | 274.8
Equity component in convertible notes |  |  |  | $ 100.2
Debt discount and issuance costs | $ 0.8 |  | $ 1.7 |
Aggregate principal amount of notes converted |  | $ 355.6 |  |
Convertible Senior Notes 1.25 Percent Due 2020 | Director |  |  |  |
Convertible Notes |  |  |  |
Aggregate principal amount of notes converted |  | $ 274.5 |  |

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- Definition Represents the percentage of the closing sales price of the common stock for at least 20 days within 30 consecutive trading days that the closing sales price of the common stock must exceed the conversion price in order for the debt instruments to be convertible. + References No definition available. + Details
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