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Debt - 1.00% Senior Convertible Notes ("2024 Notes") (Narrative) (Details) - Convertible Debt |  |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 22, 2017 USD ($) d | Feb. 27, 2017 $ / shares | Mar. 22, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($) | Mar. 03, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Carrying value of liability component |  |  |  | $ 833,200,000 | $ 931,400,000 |
Carrying value of the equity component of convertible debt |  |  |  | 239,100,000 | 229,700,000 |
Unamortized debt issuance cost |  |  |  | $ 7,700,000 | 9,200,000 |
1.00% Senior Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior convertible notes | 1.00% |  | 1.00% | 1.00% |  | 1.00%
Face amount of senior convertible notes | $ 60,000,000 |  | $ 60,000,000 |  |  | $ 400,000,000
Proceeds from issuance of senior convertible debt, after issuance costs |  |  | $ 451,100,000 |  |  |
Initial conversion price (usd per share) | $ / shares |  | $ 13.22 |  |  |  |
Premium to closing sale price of common stock (percent) |  | 32.50% |  |  |  |
Repurchase price (percent) | 100.00% |  |  |  |  |
Effective rate | 4.80% |  | 4.80% |  |  |
Derivative term | 7 years |  |  |  |  |
Carrying value of liability component | $ 358,100,000 |  | $ 358,100,000 |  |  |
Carrying value of the equity component of convertible debt | $ 101,900,000 |  | 101,900,000 |  |  |
Expected remaining term of Notes | 5 years 8 months |  |  |  |  |
Issuance costs | $ 8,900,000 |  | 8,900,000 |  |  |
Unamortized debt issuance cost |  |  |  | $ 5,800,000 |  |
Fair value of Notes |  |  |  | $ 465,300,000 | $ 481,700,000 |
1.00% Senior Convertible Notes | Conversion criteria 1 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |  |  |
Threshold trading days (days) | d | 20 |  |  |  |  |
Threshold consecutive trading days (days) | d | 30 |  |  |  |  |
1.00% Senior Convertible Notes | Conversion criteria 2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold trading days (days) | d | 45 |  |  |  |  |
Trading days used to calculate stock price trigger (days) | d | 10 |  |  |  |  |
1.00% Senior Convertible Notes | Conversion criteria 3 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold percentage of stock price trigger | 10.00% |  |  |  |  |
1.00% Senior Convertible Notes | Conversion criteria 4 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold percentage of stock price trigger | 98.00% |  |  |  |  |
Threshold consecutive trading days (days) | d | 10 |  |  |  |  |
Threshold consecutive business days (days) | 5 days |  |  |  |  |
Liability component |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance costs | $ 6,900,000 |  | 6,900,000 |  |  |
Equity component |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance costs | $ 2,000,000 |  | $ 2,000,000 |  |  |

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