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Debt - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) $ / shares shares | Nov. 30, 2018 USD ($) d $ / shares shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2021 USD ($) d shares | Sep. 30, 2020 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 19, 2018 USD ($) | Jun. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to repurchase convertible notes | $ 282,600,000 |  |  |  | $ 0 | $ 282,600,000 |  |  |  |
Repurchase and conversions of 2022 Notes (in shares) | shares | 1,953,067 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 800,000 | $ 500,000 | 800,000 | 5,900,000 |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  |  |  |  | $ 0 | 1,188,800,000 |  |  |  |
Equity component of 2025 Notes issuance, net of issuance costs |  |  |  |  |  | $ 289,400,000 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase and conversions of 2022 Notes (in shares) | shares |  |  | 200,000 | 400,000 | 200,000 | 3,400,000 |  |  |  |
Stock received from exercise of Note Hedge (in shares) | shares |  |  | (100,000) |  | (100,000) |  |  |  |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Equity component of 2025 Notes issuance, net of issuance costs |  |  |  |  |  | $ 289,400,000 |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 2,024,900,000 |  | $ 2,024,900,000 |  | $ 2,057,500,000 |  |  |
Senior Notes | Senior Convertible Notes due 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount | $ 260,000,000 |  |  |  |  |  |  |  |  | $ 400,000,000
Debt instrument convertible principal amount exercised |  |  |  | $ 37,200,000 |  | 140,000,000 |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 500,000 |  | $ 5,900,000 |  |  |  |
Interest rate on convertible notes (as a percent) |  |  |  |  |  |  |  |  |  | 0.75%
Redemption price (as a percent) |  |  |  |  | 100.00% |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2022 | Common Stock |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase and conversions of 2022 Notes (in shares) | shares |  |  |  | 375,178 |  | 1,412,497 |  |  |  |
Senior Notes | Senior Convertible Notes due 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 850,000,000 | 817,400,000 |  | $ 817,400,000 |  | 850,000,000.0 |  |  |
Debt instrument convertible principal amount exercised |  |  | 32,600,000 |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ (800,000) |  |  |  |  |  |  |
Interest rate on convertible notes (as a percent) |  | 0.75% |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  | $ 836,600,000 |  |  |  |  |  |  |  |
Conversion amount |  | $ 1,000 |  |  |  |  |  |  |  |
Conversion price of convertible notes (USD per share) | $ / shares |  | $ 164.29 |  |  |  |  |  |  |  |
Stock received from exercise of Note Hedge (in shares) | shares |  |  | 122,209 |  |  |  |  |  |  |
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% |  |  |  |  |
Common stock issued to settle converted debt (in 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 |  |  |  |  |  |  |  |
Conversion ratio |  | 0.0060869 |  |  |  |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2023 | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued upon conversion of senior notes (in shares) | shares |  | 5,200,000 |  |  |  |  |  |  |  |
Equity component of 2025 Notes issuance, net of issuance costs |  | $ 218,900,000 |  |  |  |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2023 | Debt Instrument Conversion Term One | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  | 20 |  |  |  |  |
Proportion of applicable conversion price (as a percent) |  |  |  |  | 130.00% |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2023 | Debt Instrument Conversion Term One | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  | 30 |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2023 | Debt Instrument Conversion Term Two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  | 5 |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2023 | Debt Instrument Conversion Term Two | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  | 5 |  |  |  |  |
Proportion of applicable conversion price (as a percent) |  |  |  |  | 98.00% |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2023 | Common Stock |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase and conversions of 2022 Notes (in shares) | shares |  |  | 197,816 |  | 197,876 |  |  |  |  |
Treasury stock reissued (in shares) | shares |  |  | 45,745 |  | 45,745 |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2023 | Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Recognized additional paid-in capital from cash conversion option |  |  |  |  |  |  |  | $ 171,600,000 |  |
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 |  | 1,207,500,000 |  |  |
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 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% |  |  |  |  |
Conversion ratio | 0.0016655 |  |  |  |  |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2025 | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Recognized additional paid-in capital from cash conversion option |  |  |  |  |  |  | $ 289,400,000 |  |  |
Senior Notes | Senior Convertible Notes due 2025 | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion ratio | 0.0023732 |  |  |  |  |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2025 | Debt Instrument Conversion Term One | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  | 20 |  |  |  |  |
Proportion of applicable conversion price (as a percent) |  |  |  |  | 130.00% |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2025 | Debt Instrument Conversion Term One | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  | 30 |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2025 | Debt Instrument Conversion Term Two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  | 5 |  |  |  |  |
Senior Notes | Senior Convertible Notes due 2025 | Debt Instrument Conversion Term Two | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  | 5 |  |  |  |  |
Proportion of applicable conversion price (as a percent) |  |  |  |  | 98.00% |  |  |  |  |
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 |
Value of unrestricted cash on hand threshold |  |  |  |  | $ 100,000,000 |  |  |  |  |
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 | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.375% |  |  |  |  |
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% |  |  |  |  |
Line of Credit | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 2.00% |  |  |  |  |

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