Income Taxes (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2021 USD ($)
Noncontrolling Interest [Line Items]
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent	5.20%
Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Net loss attributable to noncontrolling interest	$ (196.0)
In-process research & development assets (IPR&D)	$ 193.3

Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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Amount after tax of income (loss) from continuing operations attributable to the noncontrolling interest.

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