Intangible Assets and Goodwill - Changes in Goodwill (Details) $ in Millions	9 Months Ended
Sep. 30, 2026 USD ($)
Summary of roll forward of the changes in goodwill
Goodwill, beginning of period	$ 6,491.1
Other	(2.0)
Goodwill, end of period	6,992.6
Apellis Pharmaceuticals, Inc.
Summary of roll forward of the changes in goodwill
Goodwill resulting from acquisition	$ 503.5

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details