Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions		1 Months Ended
Dec. 01, 2022	Dec. 31, 2022	Jun. 30, 2023
Business Acquisition [Line Items]
Goodwill		$ 4,073.0	$ 4,078.9
Akouos Acquisition
Business Acquisition [Line Items]
Cash	$ 153.2
Acquired IPR&D	184.0
Goodwill	187.1
Other assets and liabilities, net	23.0
Acquisition date fair value of consideration transferred	547.3
Cash acquired	(153.2)
Fair value of CVR liability	(66.9)
Cash paid, net of cash acquired	$ 327.2	$ 327.2

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets (Liabilities), Net

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The amount of liability arising from an inherited contingency (as defined) which has been recognized as of the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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