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Acquisitions (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2021 USD ($) right $ / shares | Feb. 29, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired IPR&D Expense |  |  | $ 174,000,000 | $ 0 | $ 498,300,000 | $ 294,100,000 |
Cash paid, net of cash acquired |  |  |  |  | 747,400,000 | 849,300,000 |
Goodwill |  |  | $ 3,884,100,000 |  | 3,884,100,000 |  | $ 3,766,500,000
Repayments of long-term debt |  |  |  |  | $ 1,905,300,000 | $ 276,300,000 |
Prevail Therapeutics Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition, share price (in dollars per share) | $ / shares | $ 22.50 |  |  |  |  |  |
Cash paid, net of cash acquired | $ 747,400,000 |  |  |  |  |  |
Consideration transferred, number of contingent value rights | right | 1 |  |  |  |  |  |
Contingent value right, additional price per share (up to) (in dollars per share) | $ / shares | $ 4.00 |  |  |  |  |  |
Contingent value right, additional price per share, aggregate amount | $ 160,000,000 |  |  |  |  |  |
Contingent value right, monthly reduction (in cents per share) | $ / shares | $ 0.083 |  |  |  |  |  |
Goodwill | $ 118,800,000 |  |  |  |  |  |
Acquired IPR&D | 824,000,000.0 |  |  |  |  |  |
Deferred income taxes assumed | $ 98,000,000.0 |  |  |  |  |  |
Dermira |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  | $ 849,300,000 |  |  |  |  |
Goodwill |  | 86,800,000 |  |  |  |  |
Acquired IPR&D |  | 1,200,000,000 |  |  |  |  |
Deferred income taxes assumed |  | 49,500,000 |  |  |  |  |
Long-term debt assumed |  | $ 375,500,000 |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  | $ 276,200,000

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