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Derivative and hedging activities - Gain (Loss) on Net Investment Hedges (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
3.875% unsecured notes | Foreign currency denominated debt | Net Investment Hedging | Designated as Hedging Instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net investment hedges | $ 7.5 | $ (11.0)

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- Definition Amount, before tax, of increase (decrease) in the cumulative translation adjustment from gain (loss) on foreign currency derivatives that are designated as, and are effective as, economic hedges of a net investment in a foreign entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481694/830-30-45-20 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 20 -Name Accounting Standards Codification -Section 35 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482014/830-20-35-3 + Details
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