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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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