Provision For Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Provision For Income Taxes
Effective tax rate	6.70%		45.40%	9.50%	49.70%
Swiss tax reform			$ 15.3
Valuation allowance, provision against tax benefit expected to expire			8.5
Tax benefits	$ 63.5		0.0	$ 63.5	$ 0.0
Provision for (benefit from) income taxes	(25.1)		$ 30.8	(41.8)	53.4
Goodwill impairment charges	$ 349.0	$ 297.1		$ 349.0
Change in valuation allowances					$ 35.6

The amount of valuation allowance provided against tax benefits expected to expire prior to utilization.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount 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 increase (decrease) in the valuation allowance for deferred tax assets.

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Amount 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 increase (decrease) in the income tax rates.

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Amount of unrecognized tax benefits.

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