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Debt 0.75 Senior convertible notes Narrative (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 13, 2017 | Nov. 30, 2018 USD ($) d $ / shares | May 31, 2017 USD ($) $ / shares | Dec. 31, 2018 USD ($) d | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2017 USD ($) | May 12, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of convertible debt, net of issuance costs |  |  |  | $ 836,600,000 | $ 389,000,000 | $ 0 |  |
Accretion of debt discount |  |  |  | 17,900,000 | 9,400,000 | 100,000 |  |
Senior Notes | Convertible Notes due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on convertible notes |  | 0.75% |  |  |  |  |  |
Principal amount |  | $ 750,000,000 |  | 850,000,000 | 0 |  |  |
Proceeds from issuance of convertible debt, net of issuance costs |  | $ 836,600,000 |  |  |  |  |  |
Conversion Ratio | 0.0100918 | 0.0060869 |  |  |  |  |  |
Conversion price of convertible notes | $ / shares |  | $ 164.29 |  |  |  |  |  |
Contractual coupon interest |  |  |  | 500,000 |  |  |  |
Accretion of debt discount |  |  |  | $ 2,600,000 |  |  |  |
Amortization of debt discount |  |  |  |  |  | 200,000 |  |
Effective interest rate on notes |  |  |  | 5.63% |  |  |  |
Holder's repurchase price percentage in event of fundamental change |  |  |  | 100.00% |  |  |  |
Debt Instrument, Convertible, Exercised Option To Purchase Additional Aggregate Principal |  | $ 100,000,000 |  |  |  |  |  |
Conversion amount |  |  |  | $ 1,000 |  |  |  |
Number of trading days | d |  | 60 |  |  |  |  |  |
Redemption price percentage |  |  |  | 100.00% |  |  |  |
Senior Notes | Convertible Notes due 2023 | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  | 20 |  |  |  |
Redemption price percentage |  |  |  | 130.00% |  |  |  |
Senior Notes | Convertible Notes due 2023 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  | 30 |  |  |  |
Senior Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on convertible notes |  |  | 0.75% |  |  |  |  | 0.75%
Principal amount |  |  |  | $ 400,000,000.0 | 400,000,000.0 |  | $ 50,000,000.0 | $ 350,000,000.0
Proceeds from issuance of convertible debt, net of issuance costs |  |  | $ 389,000,000 |  |  |  |  |
Conversion price of convertible notes | $ / shares |  |  | $ 99.09 |  |  |  |  |
Debt Instrument, Percent of Conversion Price, Last Reported Sale Price of Common Stock |  |  |  | 140.00% |  |  |  |
Contractual coupon interest |  |  |  | $ 3,000,000 | 1,900,000 |  |  |
Accretion of debt discount |  |  |  | $ 13,400,000 | 8,200,000 |  |  |
Amortization of debt discount |  |  |  |  | 1,000,000 | $ 1,600,000 |  |
Effective interest rate on notes |  |  |  | 5.10% |  |  |  |
Holder's repurchase price percentage in event of fundamental change |  |  |  | 100.00% |  |  |  |
Conversion amount |  |  |  | $ 1,000 |  |  |  |
Redemption price percentage |  |  |  | 100.00% |  |  |  |
Additional paid-in capital | Senior Notes | Convertible Notes due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Recognized additional paid-in capital from cash conversion option |  |  |  | $ 174,400,000 |  |  |  |
Additional paid-in capital | Senior Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Recognized additional paid-in capital from cash conversion option |  |  |  |  | $ 72,600,000 |  |  |
Debt Instrument Conversion Term One | Senior Notes | Convertible Notes due 2023 | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of applicable conversion price |  |  |  | 130.00% |  |  |  |
Number of trading days | d |  |  |  | 20 |  |  |  |
Debt Instrument Conversion Term One | Senior Notes | Convertible Notes due 2023 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  | 30 |  |  |  |
Debt Instrument Conversion Term One | Senior Notes | Convertible Notes due 2022 | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of applicable conversion price |  |  |  | 130.00% |  |  |  |
Number of trading days | d |  |  |  | 20 |  |  |  |
Debt Instrument Conversion Term One | Senior Notes | Convertible Notes due 2022 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  | 30 |  |  |  |
Debt Instrument Conversion Term Two | Senior Notes | Convertible Notes due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Conversion amount |  |  |  | $ 1,000 |  |  |  |
Number of trading days | d |  |  |  | 5 |  |  |  |
Debt Instrument Conversion Term Two | Senior Notes | Convertible Notes due 2023 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of applicable conversion price |  |  |  | 98.00% |  |  |  |
Number of trading days | d |  |  |  | 5 |  |  |  |
Debt Instrument Conversion Term Two | Senior Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  | 5 |  |  |  |
Debt Instrument Conversion Term Two | Senior Notes | Convertible Notes due 2022 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of applicable conversion price |  |  |  | 98.00% |  |  |  |
Number of trading days | d |  |  |  | 5 |  |  |  |

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