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Debt - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Jun. 29, 2020 | Jul. 24, 2020 USD ($) shares | May 31, 2020 USD ($) $ / shares shares | Nov. 30, 2018 USD ($) d $ / shares shares | Jun. 30, 2017 USD ($) $ / shares | Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) d shares | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 19, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  |  |  |  |  |  |  | $ 1,188,800,000 | $ 0 |  |  |  |
Payments to repurchase convertible notes |  |  |  |  |  |  |  | 282,600,000 | 0 |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 5,400,000 | $ 0 | 5,400,000 | $ 0 |  |  |  |
Equity component of 2025 Notes issuance, net of issuance costs |  |  |  |  |  | 289,400,000 |  | 289,400,000 |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 2,094,700,000 |  | 2,094,700,000 |  |  |  | $ 1,250,000,000.0 |
Conversion amount |  |  |  |  |  | 1,000 |  | $ 1,000 |  |  |  |  |
Redemption price (as a percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Unamortized debt discount |  |  |  |  |  | 414,200,000 |  | $ 414,200,000 |  |  |  | 177,200,000 |
Unamortized debt issuance costs |  |  |  |  |  | 21,700,000 |  | 21,700,000 |  |  |  | 13,100,000 |
Senior Notes | Senior Convertible Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 850,000,000.0 |  | $ 850,000,000.0 |  | $ 850,000,000.0 |  |  |  | 850,000,000.0 |
Interest rate on convertible notes (as a percent) |  |  |  | 0.75% |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  |  |  | $ 836,600,000 |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  | 0.0060869 |  |  |  |  |  |  |  |  |
Conversion amount |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Conversion price of convertible notes (USD per share) | $ / shares |  |  |  | $ 164.29 |  |  |  |  |  |  |  |  |
Holder's repurchase price percentage in event of fundamental change (as a percent) |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |  |
Number of trading days | d |  |  |  | 60 |  |  |  |  |  |  |  |  |
Proportion of conversion price (as a percent) |  |  |  |  |  |  |  | 130.00% |  |  |  |  |
Redemption price (as a percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Stock counterparties to acquire with warrants purchased (shares) | shares |  |  |  | 5,200,000 |  |  |  |  |  |  |  |  |
Proceeds from sale of warrants |  |  |  | $ 183,800,000 |  |  |  |  |  |  |  |  |
Exercise price of warrants or rights (USD per share) | $ / shares |  |  |  | $ 198.38 |  |  |  |  |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 260,000,000.0 |  | $ 400,000,000.0 | $ 37,200,000 |  | $ 37,200,000 |  |  |  | 400,000,000.0 |
Interest rate on convertible notes (as a percent) |  |  |  |  | 0.75% |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  |  |  |  | $ 389,000,000.0 |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  | 0.0100918 |  |  |  |  |  |  |  |
Conversion price of convertible notes (USD per share) | $ / shares |  |  |  |  | $ 99.09 |  |  |  |  |  |  |  |
Holder's repurchase price percentage in event of fundamental change (as a percent) |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |  |
Proportion of conversion price (as a percent) |  |  |  |  |  |  |  | 140.00% |  |  |  |  |
Redemption price (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of exercised options to covert |  |  |  |  |  | $ (102,800,000) |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | 5,400,000 |  |  |  |  |  |  |
Unamortized debt discount |  |  |  |  |  | 2,800,000 |  | $ 2,800,000 |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  | 300,000 |  | 300,000 |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2022 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 32,500,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 1,210,000,000 |  |  | $ 1,207,500,000 |  | $ 1,207,500,000 |  |  |  | $ 0 |
Interest rate on convertible notes (as a percent) |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  |  | $ 1,190,000,000 |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  | 0.0016655 |  |  |  |  |  |  |  |  |  |
Conversion price of convertible notes (USD per share) | $ / shares |  |  | $ 600.42 |  |  |  |  |  |  |  |  |  |
Holder's repurchase price percentage in event of fundamental change (as a percent) |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |  |
Proportion of conversion price (as a percent) |  |  |  |  |  |  |  | 130.00% |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2025 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  | 0.0023732 |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of revolving credit agreement |  |  |  |  |  | $ 200,000,000.0 |  | $ 200,000,000.0 |  |  |  |  | $ 200,000,000.0
Option to increase revolving line of credit |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Value of unrestricted cash on hand threshold |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |
Line of Credit | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on convertible notes (as a percent) |  |  |  |  |  | 0.375% |  | 0.375% |  |  |  |  |
Unused capacity fee (as a percent) |  |  |  |  |  |  |  | 0.20% |  |  |  |  |
Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on convertible notes (as a percent) |  |  |  |  |  | 1.00% |  | 1.00% |  |  |  |  |
Unused capacity fee (as a percent) |  |  |  |  |  |  |  | 0.30% |  |  |  |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity component of 2025 Notes issuance, net of issuance costs |  |  |  |  |  | $ 289,400,000 |  | $ 289,400,000 |  |  |  |  |
Additional Paid-In Capital | Senior Notes | Senior 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 | Senior Convertible Notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized additional paid-in capital from cash conversion option |  |  |  |  |  |  |  |  |  |  | $ 72,600,000 |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase and conversions of 2022 Notes, net of tax (shares) | shares |  |  |  |  |  | 3,000,000.0 |  | 3,000,000.0 |  |  |  |  |
Common Stock | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase and conversions of 2022 Notes, net of tax (shares) | shares |  |  | 1,953,067 |  |  |  |  |  |  |  |  |  |
Common Stock | Senior Notes | Senior Convertible Notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase and conversions of 2022 Notes, net of tax (shares) | shares |  |  |  |  |  | 1,037,319 |  |  |  |  |  |  |
Common Stock | Senior Notes | Senior Convertible Notes due 2022 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase and conversions of 2022 Notes, net of tax (shares) | shares |  | 327,834 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Conversion Term One | Senior Notes | Senior Convertible Notes due 2023 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 20 |  |  |  |  |
Proportion of applicable conversion price (as a percent) |  |  |  |  |  |  |  | 130.00% |  |  |  |  |
Debt Instrument Conversion Term One | Senior Notes | Senior Convertible Notes due 2023 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 30 |  |  |  |  |
Debt Instrument Conversion Term One | Senior Notes | Senior Convertible Notes due 2022 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 20 |  |  |  |  |
Proportion of applicable conversion price (as a percent) |  |  |  |  |  |  |  | 130.00% |  |  |  |  |
Debt Instrument Conversion Term One | Senior Notes | Senior Convertible Notes due 2022 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 30 |  |  |  |  |
Debt Instrument Conversion Term One | Senior Notes | Senior Convertible Notes due 2025 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 20 |  |  |  |  |
Proportion of applicable conversion price (as a percent) |  |  |  |  |  |  |  | 130.00% |  |  |  |  |
Debt Instrument Conversion Term One | Senior Notes | Senior Convertible Notes due 2025 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 30 |  |  |  |  |
Debt Instrument Conversion Term Two | Senior Notes | Senior Convertible Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 5 |  |  |  |  |
Debt Instrument Conversion Term Two | Senior Notes | Senior Convertible Notes due 2023 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 5 |  |  |  |  |
Proportion of applicable conversion price (as a percent) |  |  |  |  |  |  |  | 98.00% |  |  |  |  |
Debt Instrument Conversion Term Two | Senior Notes | Senior Convertible Notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 5 |  |  |  |  |
Debt Instrument Conversion Term Two | Senior Notes | Senior Convertible Notes due 2022 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 5 |  |  |  |  |
Proportion of applicable conversion price (as a percent) |  |  |  |  |  |  |  | 98.00% |  |  |  |  |
Debt Instrument Conversion Term Two | Senior Notes | Senior Convertible Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 5 |  |  |  |  |
Debt Instrument Conversion Term Two | Senior Notes | Senior Convertible Notes due 2025 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 5 |  |  |  |  |
Proportion of applicable conversion price (as a percent) |  |  |  |  |  |  |  | 98.00% |  |  |  |  |
Designated as Hedging Instrument | Senior Notes | Senior Convertible Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued upon conversion of senior notes (shares) | shares |  |  |  | 5,200,000 |  |  |  |  |  |  |  |  |
Equity component of 2025 Notes issuance, net of issuance costs |  |  |  | $ 218,900,000 |  |  |  |  |  |  |  |  |
Designated as Hedging Instrument | Senior Notes | Senior Convertible Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity component of 2025 Notes issuance, net of issuance costs |  |  | $ 289,400,000 |  |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Line of Credit | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  | 1.375% |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  | 2.00% |  |  |  |  |

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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51819886&loc=SL6014347-161799 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870 + Details
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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature. + References No definition available. + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition The amount of the liability for the conversion option reclassified to stockholders' equity when the embedded option no longer required separation from the host instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35708913&loc=d3e50896-113970 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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