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Interim Financial Statements - Schedule of Statements of Operations Data (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues | $ 2,294.0 | $ 1,743.7 | $ 6,074.2 | $ 4,694.1
Research and development | 684.6 | 526.0 | 1,990.5 | 1,897.6
Selling, general, and administrative | 326.9 | 304.4 | 1,042.5 | 890.1
Other operating (income) expense, net | (44.6) | (50.7) | (135.2) | (171.1)
Total operating expenses | 1,240.9 | 1,005.2 | 3,664.6 | 3,160.0
Collaboration and contract manufacturing |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cost of collaboration and contract manufacturing | 143.0 | 109.6 | 454.5 | 289.6
Sanofi | Product and service, other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues | 353.3 | 175.0 | 869.3 | 232.8
Bayer | Product and service, other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues | 299.9 | 293.6 | 825.5 | 834.8
Other | Product and service, other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues | $ 158.6 | 36.8 | $ 433.6 | 78.5
As Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues |  | 2,048.4 |  | 5,693.9
Research and development |  | 663.4 |  | 2,353.5
Selling, general, and administrative |  | 419.9 |  | 1,248.0
Other operating (income) expense, net |  | 0.0 |  | 0.0
Total operating expenses |  | 1,309.9 |  | 4,159.8
As Previously Reported | Collaboration and contract manufacturing |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cost of collaboration and contract manufacturing |  | 110.7 |  | 304.5
As Previously Reported | Sanofi | Product and service, other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues |  | 404.2 |  | 999.7
As Previously Reported | Bayer | Product and service, other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues |  | 302.8 |  | 868.0
As Previously Reported | Other | Product and service, other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues |  | 103.1 |  | 278.2
Adjustments |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues |  | (304.7) |  | (999.8)
Research and development |  | (137.4) |  | (455.9)
Selling, general, and administrative |  | (115.5) |  | (357.9)
Other operating (income) expense, net |  | (50.7) |  | (171.1)
Total operating expenses |  | (304.7) |  | (999.8)
Adjustments | Collaboration and contract manufacturing |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cost of collaboration and contract manufacturing |  | (1.1) |  | (14.9)
Adjustments | Sanofi | Product and service, other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues |  | (229.2) |  | (766.9)
Adjustments | Bayer | Product and service, other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues |  | (9.2) |  | (33.2)
Adjustments | Other | Product and service, other |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Revenues |  | $ (66.3) |  | $ (199.7)

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