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Interim Financial Statements - Schedule of Balance Sheet Data (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accrued expenses and other current liabilities | $ 1,303.0 | $ 1,211.4
Other liabilities - Sanofi | 96.9 | 85.0
Other noncurrent liabilities | 454.0 | 317.7
Sanofi |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred revenue, current | 409.3 | 310.5
Deferred revenue, noncurrent | 37.9 | 27.7
Other noncurrent liabilities | 367.0 | 482.0
Other |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred revenue, current | 85.5 | 71.6
Deferred revenue, noncurrent | $ 67.0 | 77.6
As Previously Reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accrued expenses and other current liabilities |  | 1,086.8
Other liabilities - Sanofi |  | 0.0
Other noncurrent liabilities |  | 286.0
As Previously Reported | Sanofi |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred revenue, current |  | 395.5
Deferred revenue, noncurrent |  | 509.7
Other noncurrent liabilities |  | 0.0
As Previously Reported | Other |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred revenue, current |  | 196.2
Deferred revenue, noncurrent |  | 109.3
Adjustments |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accrued expenses and other current liabilities |  | 124.6
Other liabilities - Sanofi |  | 85.0
Other noncurrent liabilities |  | 31.7
Adjustments | Sanofi |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred revenue, current |  | (85.0)
Deferred revenue, noncurrent |  | (482.0)
Other noncurrent liabilities |  | 482.0
Adjustments | Other |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred revenue, current |  | (124.6)
Deferred revenue, noncurrent |  | $ (31.7)

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