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Debt 0.75% Senior convertible notes due 2022 Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2017 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) d | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | May 12, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  | $ 400,000,000 |  |
Proceeds from convertible debt |  |  |  | 0 | $ 389,000,000 |  |  |
Non-cash interest expense |  |  |  | 11,300,000 | 5,700,000 |  |  |
Estimated litigation liability |  | 0 |  | 0 |  |  |  |
Senior Notes | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount | $ 350,000,000.0 |  |  |  |  |  | $ 50,000,000.0 |
Interest rate on convertible notes | 0.75% |  |  |  |  |  |  | 0.75%
Proceeds from convertible debt | $ 389,000,000 |  |  |  |  |  |  |
Initial conversion price of convertible notes (in dollars per share) | $ / shares | $ 99.09 |  |  |  |  |  |  |
Contractual coupon interest rate |  | 800,000 | $ 800,000 | 2,300,000 | 1,100,000 |  |  |
Non-cash interest expense |  | 3,400,000 | 3,100,000 | 10,000,000 | 4,900,000 |  |  |
Amortization of debt issuance costs |  | $ 400,000 | $ 400,000 | $ 1,200,000 | 600,000 |  |  |
Effective interest rate |  | 5.10% |  | 5.10% |  |  |  |
Conversion price in event of fundamental change |  | 100.00% |  | 100.00% |  |  |  |
Conversion multiple |  | $ 1,000 |  | $ 1,000 |  |  |  |
Debt instrument, redemption price, percentage |  |  |  | 100.00% |  |  |  |
Debt instrument, convertible, conversion ratio | 0.0100918 |  |  |  |  |  |  |
Senior Notes | Additional Paid-in Capital | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount reclassified to stockholders' equity |  |  |  |  | $ 72,600,000 |  |  |
Senior Notes | Term of at least 20 trading days during a period of 30 consecutive trading days | Minimum | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold consecutive trading days | d |  |  |  | 20 |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |
Senior Notes | Term of at least 20 trading days during a period of 30 consecutive trading days | Maximum | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold consecutive trading days | d |  |  |  | 30 |  |  |  |
Senior Notes | Term of five business day period after any five consecutive trading day period | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold consecutive trading days | d |  |  |  | 5 |  |  |  |
Senior Notes | Term of five business day period after any five consecutive trading day period | Maximum | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold consecutive trading days | d |  |  |  | 5 |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 98.00% |  |  |  |

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