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Fair value measurements (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase (decrease) in equity securities, FV-NI	$ 3.5	$ 3.2
Carrying value of long-term investments in equity	27.9	$ 22.6
Fair value, nonrecurring | Fair value, inputs, level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets at fair value	13,334.2
Goodwill at fair value	8,942.5
Net intangible assets at fair value	$ 4,391.7

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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