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Debt - Schedule of senior convertible notes (Details) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Nov. 30, 2018 | Jun. 30, 2017
Senior Notes [Abstract] |  |  |  |  |
Net carrying amount of Senior Convertible Notes due 2022 | $ 1,034,700,000 |  | $ 1,010,300,000 |  |
Senior Notes |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |
Fair value of outstanding senior convertible notes: | 1,635,200,000 |  | 1,399,800,000 |  |
Amount by which the notes' if-converted value exceeds their principal amount: | 322,500,000 | $ 125,400,000 |  |  |
Senior Notes | Senior convertible notes due 2022 |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |
Principal amount | 400,000,000.0 |  | 400,000,000.0 |  | $ 400,000,000.0
Unamortized debt discount | (44,200,000) |  | (51,100,000) |  |
Unamortized debt issuance costs | (5,500,000) |  | (6,300,000) |  |
Net carrying amount of Senior Convertible Notes due 2022 | 350,300,000 |  | 342,600,000 |  |
Fair value of outstanding senior convertible notes: | 638,300,000 |  | 540,200,000 |  |
Amount by which the notes' if-converted value exceeds their principal amount: | 225,500,000 | 125,400,000 |  |  |
Senior Notes | Senior convertible notes due 2023 |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |
Principal amount | 850,000,000.0 |  | 850,000,000.0 | $ 850,000,000.0 |
Unamortized debt discount | (156,100,000) |  | (171,800,000) |  |
Unamortized debt issuance costs | (9,500,000) |  | (10,500,000) |  |
Net carrying amount of Senior Convertible Notes due 2022 | 684,400,000 |  | 667,700,000 |  |
Fair value of outstanding senior convertible notes: | 996,900,000 |  | 859,600,000 |  |
Amount by which the notes' if-converted value exceeds their principal amount: | 97,000,000.0 | $ 0 |  |  |
Senior Notes | Zero Point Seven Five Percent Senior Convertible Notes |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |
Total net carrying amount of senior convertible notes | $ 1,034,700,000 |  | $ 1,010,300,000 |  |

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + 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 (c) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + 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=114775744&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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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