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Legal Matters (Details) $ in Millions | Jul. 16, 2020 claim | Jul. 31, 2017 claim | Sep. 26, 2016 EUR (€) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Feb. 25, 2019 claim | Feb. 14, 2019 claim
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Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency accrual | $ |  |  |  | $ 132.2 | $ 100.0 |  |
Amgen v.s. Regeneron | Pending Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency, damages sought, per unit produced | € |  |  | € 10,000 |  |  |  |
Loss contingency, damages sought | € |  |  | € 10,000,000.0 |  |  |  |
'165 Patent | Amgen v.s. Regeneron | Pending Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Pending claims |  |  |  |  |  | 2 |
Invalid claims |  |  |  |  |  | 2 |
'741 Patent | Amgen v.s. Regeneron | Pending Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Pending claims |  |  |  |  |  | 1 |
'487 Patent |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of IPR filed |  | 2 |  |  |  |  |
Number of claims invalidated |  |  |  |  |  |  | 17
'631 Patent |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of IPR filed | 2 |  |  |  |  |  |

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