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Debt and Credit Arrangements - 2024 Notes Narratives (Details) $ / shares in Units, shares in Thousands |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 06, 2017 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) day $ / shares | Dec. 31, 2018 USD ($) | Oct. 31, 2017 $ / shares
Common Stock |  |  |  |  |
Debt Instrument |  |  |  |  |
Share price (usd per share) | $ / shares |  |  | $ 62.36 |  |
Convertible Debt | Convertible Notes, due 2024 |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument stated interest rate (percent) | 1.00% |  |  |  |
Debt instrument face amount | $ 258,800,000 |  | $ 258,800,000 | $ 258,800,000 |
Share conversion rate | 0.0170285 |  |  |  |
Debt instrument, conversion price (usd per share) | $ / shares | $ 58.725 |  |  |  |
Debt instrument, conversion premium | 35.00% |  |  |  |
Share price (usd per share) | $ / shares |  |  |  |  | $ 43.50
Debt instrument, excess over fair value if converted |  |  | $ 16,000,000.0 |  |
Debt instrument, threshold for consecutive trading days | day |  |  | 20 |  |
Debt instrument, threshold for consecutive trading days | day |  |  | 30 |  |
Applicable conversion price threshold (as percentage) |  |  | 130.00% |  |
Maximum days after five trading days |  |  | 5 days |  |
Applicable conversion price, less than (as percentage) |  |  | 97.00% |  |
Debt instrument effective interest rate | 4.80% |  |  |  |
Non cash payment for derivative instrument |  | $ 59,500,000 |  |  |
Number of shares underlying warrant | shares |  | 4,410 |  |  |
Proceeds from issuances of warrants |  | $ 46,000,000.0 |  |  |
Percentage above previous sales price |  | 65.00% |  |  |
Net cost of convertible note hedge and warrant |  | $ 13,500,000 |  |  |
Convertible Debt | Convertible Notes, due 2024 | Maximum |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument, conversion price (usd per share) | $ / shares |  | $ 71.775 |  |  |
Convertible Debt | Convertible Notes, due 2024 | Liability Component |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument face amount | $ 200,100,000 |  |  |  |
Debt issuance costs | 5,300,000 |  |  |  |
Convertible Debt | Convertible Notes, due 2024 | Equity Component |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument face amount | 58,700,000 |  |  |  |
Debt issuance costs | $ 1,500,000 |  |  |  |

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